1
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Velten S, Bocklage L, Zhang X, Schlage K, Panchwanee A, Sadashivaiah S, Sergeev I, Leupold O, Chumakov AI, Kocharovskaya O, Röhlsberger R. Nuclear quantum memory for hard x-ray photon wave packets. SCIENCE ADVANCES 2024; 10:eadn9825. [PMID: 38924415 PMCID: PMC11204287 DOI: 10.1126/sciadv.adn9825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 05/21/2024] [Indexed: 06/28/2024]
Abstract
Optical quantum memories are key elements in modern quantum technologies to reliably store and retrieve quantum information. At present, they are conceptually limited to the optical wavelength regime. Recent advancements in x-ray quantum optics render an extension of optical quantum memory protocols to ultrashort wavelengths possible, thereby establishing quantum photonics at x-ray energies. Here, we introduce an x-ray quantum memory protocol that utilizes mechanically driven nuclear resonant 57Fe absorbers to form a comb structure in the nuclear absorption spectrum by using the Doppler effect. This room-temperature nuclear frequency comb enables us to control the waveform of x-ray photon wave packets to a high level of accuracy and fidelity using solely mechanical motions. This tunable, robust, and highly flexible system offers a versatile platform for a compact solid-state quantum memory at room temperature for hard x-rays.
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Affiliation(s)
- Sven Velten
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging CUI, 22761 Hamburg, Germany
| | - Lars Bocklage
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging CUI, 22761 Hamburg, Germany
| | - Xiwen Zhang
- Department of Physics and Astronomy and Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Kai Schlage
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Anjali Panchwanee
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Sakshath Sadashivaiah
- Helmholtz-Institut Jena, Fraunhoferstr. 8, 07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - Ilya Sergeev
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Olaf Leupold
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | | | - Olga Kocharovskaya
- Department of Physics and Astronomy and Institute for Quantum Science and Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Ralf Röhlsberger
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging CUI, 22761 Hamburg, Germany
- Helmholtz-Institut Jena, Fraunhoferstr. 8, 07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- Friedrich-Schiller Universität Jena, Institut für Optik und Quantenelektronik, Max-Wien-Platz 1, 07743 Jena, Germany
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2
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Zhandun VS, Kazak NV, Kupenko I, Vasiukov DM, Li X, Blackburn E, Ovchinnikov SG. Orthogonal magnetic structures of Fe 4O 5: representation analysis and DFT calculations. Dalton Trans 2024; 53:2242-2251. [PMID: 38193857 DOI: 10.1039/d3dt03437b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
The magnetic and electronic structures of Fe4O5 have been investigated at ambient and high pressures via a combination of representation analysis, density functional theory (DFT+U) calculations, and Mössbauer spectroscopy. A few spin configurations corresponding to the different irreducible representations have been considered. The total-energy calculations reveal that the magnetic ground state of Fe4O5 corresponds to an orthogonal spin order. Depending on the magnetic propagation vector k, two spin-ordered phases with minimal energy differences are realized. The lowest energy magnetic phase is related to k = (0, 0, 0) and is characterized by ferromagnetic ordering of iron magnetic moments at prismatic sites along the b-axis and antiferromagnetic ordering of iron moments at octahedral sites along the c-axis. For the k = (1/2, 0, 0) phase, the moments in the prisms are antiferromagnetically ordered along the b-axis and the moments in the octahedra are still antiferromagnetically ordered along the c-axis. Under high pressure, Fe4O5 exhibits magnetic transitions with the corresponding electronic transitions of the metal-insulator type. At a critical pressure PC ∼ 60 GPa, the Fe ions at the octahedral sites undergo a high-spin to low-spin state crossover with a decrease in the unit-cell volume of ∼4%, while the Fe ions at the prismatic sites remain in the high-spin state up to 130 GPa. This site-dependent magnetic collapse is experimentally observed in the transformation of Mössbauer spectra measured at room temperature and high pressures.
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Affiliation(s)
- Vyacheslav S Zhandun
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia.
| | - Natalia V Kazak
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia.
| | - Ilya Kupenko
- Institut für Mineralogie, University of Münster, Corrensstr. 24, 48149 Münster, Germany
| | - Denis M Vasiukov
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, Lund 221 00, Sweden
- Materials Science and Applied Mathematics, Malmö University, Malmö 204 06, Sweden
| | - Xiang Li
- Institut für Mineralogie, University of Münster, Corrensstr. 24, 48149 Münster, Germany
| | - Elizabeth Blackburn
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, Lund 221 00, Sweden
| | - Sergei G Ovchinnikov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia.
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3
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Koemets I, Wang B, Koemets E, Ishii T, Liu Z, McCammon C, Chanyshev A, Katsura T, Hanfland M, Chumakov A, Dubrovinsky L. Crystal chemistry and compressibility of Fe 0.5Mg 0.5Al 0.5Si 0.5O 3 and FeMg 0.5Si 0.5O 3 silicate perovskites at pressures up to 95 GPa. Front Chem 2023; 11:1258389. [PMID: 37867996 PMCID: PMC10587407 DOI: 10.3389/fchem.2023.1258389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 09/19/2023] [Indexed: 10/24/2023] Open
Abstract
Silicate perovskite, with the mineral name bridgmanite, is the most abundant mineral in the Earth's lower mantle. We investigated crystal structures and equations of state of two perovskite-type Fe3+-rich phases, FeMg0.5Si0.5O3 and Fe0.5Mg0.5Al0.5Si0.5O3, at high pressures, employing single-crystal X-ray diffraction and synchrotron Mössbauer spectroscopy. We solved their crystal structures at high pressures and found that the FeMg0.5Si0.5O3 phase adopts a novel monoclinic double-perovskite structure with the space group of P21/n at pressures above 12 GPa, whereas the Fe0.5Mg0.5Al0.5Si0.5O3 phase adopts an orthorhombic perovskite structure with the space group of Pnma at pressures above 8 GPa. The pressure induces an iron spin transition for Fe3+ in a (Fe0.7,Mg0.3)O6 octahedral site of the FeMg0.5Si0.5O3 phase at pressures higher than 40 GPa. No iron spin transition was observed for the Fe0.5Mg0.5Al0.5Si0.5O3 phase as all Fe3+ ions are located in bicapped prism sites, which have larger volumes than an octahedral site of (Al0.5,Si0.5)O6.
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Affiliation(s)
- Iuliia Koemets
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Biao Wang
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
| | - Egor Koemets
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
| | - Takayuki Ishii
- Institute for Planetary Materials, Okayama University, Misasa, Japan
| | - Zhaodong Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun, China
| | - Catherine McCammon
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Artem Chanyshev
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Tomo Katsura
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
| | - Michael Hanfland
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
| | | | - Leonid Dubrovinsky
- Bayerisches Geo Institute (BGI), Universität Bayreuth, Bayreuth, Germany
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4
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Auerbach H, Faus I, Rackwitz S, Wolny JA, Chumakov AI, Knipp M, Walker FA, Schünemann V. Heme protonation affects iron-NO binding in the NO transport protein nitrophorin. J Inorg Biochem 2023; 246:112281. [PMID: 37352657 DOI: 10.1016/j.jinorgbio.2023.112281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/26/2023] [Accepted: 05/30/2023] [Indexed: 06/25/2023]
Abstract
The nitrophorins (NPs) comprise an unusual group of heme proteins with stable ferric heme iron nitric oxide (Fe-NO) complexes. They are found in the salivary glands of the blood-sucking kissing bug Rhodnius prolixus, which uses the NPs to transport the highly reactive signaling molecule NO. Nuclear resonance vibrational spectroscopy (NRVS) of both isoform NP2 and a mutant NP2(Leu132Val) show, after addition of NO, a strong structured vibrational band at around 600 cm-1, which is due to modes with significant Fe-NO bending and stretching contribution. Based on a hybrid calculation method, which uses density functional theory and molecular mechanics, it is demonstrated that protonation of the heme carboxyl groups does influence both the vibrational properties of the Fe-NO entity and its electronic ground state. Moreover, heme protonation causes a significant increase of the gap between the highest occupied and lowest unoccupied molecular orbital by almost one order of magnitude leading to a stabilization of the Fe-NO bond.
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Affiliation(s)
- Hendrik Auerbach
- Department of Physics, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Isabelle Faus
- Department of Physics, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Sergej Rackwitz
- Department of Physics, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | - Juliusz A Wolny
- Department of Physics, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany
| | | | - Markus Knipp
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany; Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
| | - F Ann Walker
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721-0041, United States
| | - Volker Schünemann
- Department of Physics, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany.
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5
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Dang N, Kozlenko DP, Lis ON, Kichanov SE, Lukin YV, Golosova NO, Savenko BN, Duong D, Phan T, Tran T, Phan M. High Pressure-Driven Magnetic Disorder and Structural Transformation in Fe 3 GeTe 2 : Emergence of a Magnetic Quantum Critical Point. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2206842. [PMID: 36698300 PMCID: PMC10037988 DOI: 10.1002/advs.202206842] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Among the recently discovered 2D intrinsic van der Waals (vdW) magnets, Fe3 GeTe2 (FGT) has emerged as a strong candidate for spintronics applications, due to its high Curie temperature (130 - 220 K) and magnetic tunability in response to external stimuli (electrical field, light, strain). Theory predicts that the magnetism of FGT can be significantly modulated by an external strain. However, experimental evidence is needed to validate this prediction and understand the underlying mechanism of strain-mediated vdW magnetism in this system. Here, the effects of pressure (0 - 20 GPa) are elucidated on the magnetic and structural properties of Fe3 GeTe2 by means of synchrotron Mössbauer source spectroscopy, X-ray powder diffraction and Raman spectroscopy over a wide temperature range of 10 - 290 K. A strong suppression of ferromagnetic ordering is observed with increasing pressure, and a paramagnetic ground state emerges when pressure exceeds a critical value, PPM ≈ 15 GPa. The anomalous pressure dependence of structural parameters and vibrational modes is observed at PC ≈ 7 GPa and attributed to an isostructural phase transformation. Density functional theory calculations complement these experimental findings. This study highlights pressure as a driving force for magnetic quantum criticality in layered vdW magnetic systems.
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Affiliation(s)
- Ngoc‐Toan Dang
- Institute of Research and DevelopmentDuy Tan UniversityDa Nang550000Vietnam
- Faculty of Environmental and Natural SciencesDuy Tan UniversityDa Nang550000Vietnam
| | | | - Olga N. Lis
- Frank Laboratory of Neutron PhysicsJINRMoscow Reg.Dubna141980Russia
- Kazan Federal UniversityKazan420008Russia
| | | | | | | | - Boris N. Savenko
- Frank Laboratory of Neutron PhysicsJINRMoscow Reg.Dubna141980Russia
| | - Dinh‐Loc Duong
- Center for Integrated Nanostructure PhysicsInstitute for Basic ScienceSuwon16419Republic of Korea
| | - The‐Long Phan
- Faculty of Engineering Physics and NanotechnologyVNU‐University of Engineering and Technology144 Xuan Thuy, Cau GiayHa Noi100000Vietnam
| | - Tuan‐Anh Tran
- Ho Chi Minh City University of Technology and EducationHo Chi Minh700000Vietnam
| | - Manh‐Huong Phan
- Department of PhysicsUniversity of South FloridaTampaFL33620USA
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6
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Kiseeva ES, Korolev N, Koemets I, Zedgenizov DA, Unitt R, McCammon C, Aslandukova A, Khandarkhaeva S, Fedotenko T, Glazyrin K, Bessas D, Aprilis G, Chumakov AI, Kagi H, Dubrovinsky L. Subduction-related oxidation of the sublithospheric mantle evidenced by ferropericlase and magnesiowüstite diamond inclusions. Nat Commun 2022; 13:7517. [PMID: 36473837 PMCID: PMC9726884 DOI: 10.1038/s41467-022-35110-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 11/18/2022] [Indexed: 12/12/2022] Open
Abstract
Ferropericlase (Mg,Fe)O is the second most abundant mineral in Earth's lower mantle and a common inclusion found in subcratonic diamonds. Pyrolitic mantle has Mg# (100 × Mg/(Mg+Fe)) ~89. However, ferropericlase inclusions in diamonds show a broad range of Mg# between 12 and 93. Here we use Synchrotron Mössbauer Source (SMS) spectroscopy and single-crystal X-ray diffraction to determine the iron oxidation state and structure of two magnesiowüstite and three ferropericlase inclusions in diamonds from São Luiz, Brazil. Inclusion Mg#s vary between 16.1 and 84.5. Ferropericlase inclusions contain no ferric iron within the detection limit of SMS, while both magnesiowüstite inclusions show the presence of monocrystalline magnesioferrite ((Mg,Fe)Fe3+2O4) with an estimated 47-53 wt% Fe2O3. We argue that the wide range of Fe concentrations observed in (Mg,Fe)O inclusions in diamonds and the appearance of magnesioferrite result from oxidation of ferropericlase triggered by the introduction of subducted material into sublithospheric mantle.
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Affiliation(s)
- Ekaterina S. Kiseeva
- grid.7872.a0000000123318773School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland
| | - Nester Korolev
- grid.465386.a0000 0004 0562 7224Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034 Russia
| | - Iuliia Koemets
- grid.7384.80000 0004 0467 6972Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Dmitry A. Zedgenizov
- grid.473268.c0000 0001 0221 8044A.N. Zavaritsky Institute of Geology and Geochemistry, 15 Vonsovskogo street, Ekaterinburg, 620016 Russia ,grid.446243.30000 0004 0646 288XUral State Mining University, 30 Kuibysheva street, Ekaterinburg, 620014 Russia
| | - Richard Unitt
- grid.7872.a0000000123318773School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland
| | - Catherine McCammon
- grid.7384.80000 0004 0467 6972Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Alena Aslandukova
- grid.7384.80000 0004 0467 6972Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Saiana Khandarkhaeva
- grid.7384.80000 0004 0467 6972Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Timofey Fedotenko
- grid.7384.80000 0004 0467 6972Materials Physics and Technology at Extreme Conditions, Laboratory of Crystallography, Universität Bayreuth, D-95440 Bayreuth, Germany ,grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Konstantin Glazyrin
- grid.7683.a0000 0004 0492 0453Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Dimitrios Bessas
- grid.5398.70000 0004 0641 6373ESRF-The European Synchrotron, CS 40220, 38043 Grenoble, Cedex 9 France
| | - Georgios Aprilis
- grid.5398.70000 0004 0641 6373ESRF-The European Synchrotron, CS 40220, 38043 Grenoble, Cedex 9 France
| | - Alexandr I. Chumakov
- grid.5398.70000 0004 0641 6373ESRF-The European Synchrotron, CS 40220, 38043 Grenoble, Cedex 9 France
| | - Hiroyuki Kagi
- grid.26999.3d0000 0001 2151 536XGeochemical Research Center, Graduate School of Science, The University of Tokyo, Tokyo, 113-0033 Japan
| | - Leonid Dubrovinsky
- grid.7384.80000 0004 0467 6972Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
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7
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Yaroslavtsev S, Chumakov AI. Synchrotron Mössbauer source: trade-off between intensity and linewidth. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1329-1337. [PMID: 36345740 PMCID: PMC9641569 DOI: 10.1107/s1600577522009316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/22/2022] [Indexed: 05/22/2023]
Abstract
A synchrotron Mössbauer source (SMS) enables conventional (energy-domain) Mössbauer spectroscopy at synchrotron radiation facilities. In comparison with radioactive sources, SMS provides a beam of several micrometres in size, permitting studies of extremely small samples. The SMS linewidth can be narrowed at the expense of its intensity by varying the angular position and temperature of the key element of the SMS - an iron borate 57FeBO3 crystal. Here, in order to optimize the SMS performance, the angular and temperature dependencies of the SMS parameters have been studied and the optimal angular position and temperature of the crystal have been determined for highest intensity at specified source width. The results show that, when accepting broadening of the source width up to ∼6 natural widths, the intensity of the SMS at the European Synchrotron reaches more than 105 γ-quanta s-1. In the opposite extreme, the width of the source approaches the natural width with intensity decreasing to about 103 γ-quanta s-1. These changes of intensity up to two orders of magnitude take place over a temperature range of about 0.5°C. For all temperature and angular conditions, the instrumental function of the source was derived; we also analyzed the modification of its shape when passing from the `low-width' to `high-intensity' extremes of SMS operation. Finally, we estimated the influence of the temperature instability and mosaicity of the iron borate crystal on the SMS performance.
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Affiliation(s)
- Sergey Yaroslavtsev
- ESRF – The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
- Correspondence e-mail:
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8
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Stankov S, Merkel DG, Kalt J, Göttlicher J, Łażewski J, Sternik M, Jochym PT, Piekarz P, Baumbach T, Chumakov AI, Rüffer R. Phonon confinement and interface lattice dynamics of ultrathin high- k rare earth sesquioxide films: the case of Eu 2O 3 on YSZ(001). NANOSCALE ADVANCES 2021; 4:19-25. [PMID: 36132967 PMCID: PMC9419856 DOI: 10.1039/d1na00728a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 11/23/2021] [Indexed: 06/16/2023]
Abstract
The spatial confinement of atoms at surfaces and interfaces significantly alters the lattice dynamics of thin films, heterostructures and multilayers. Ultrathin films with high dielectric constants (high-k) are of paramount interest for applications as gate layers in current and future integrated circuits. Here we report a lattice dynamics study of high-k Eu2O3 films with thicknesses of 21.3, 2.2, 1.3, and 0.8 nm deposited on YSZ(001). The Eu-partial phonon density of states (PDOS), obtained from nuclear inelastic scattering, exhibits broadening of the phonon peaks accompanied by up to a four-fold enhancement of the number of low-energy states compared to the ab initio calculated PDOS of a perfect Eu2O3 crystal. Our analysis demonstrates that while the former effect reflects the reduced phonon lifetimes observed in thin films due to scattering from lattice defects, the latter phenomenon arises from an ultrathin EuO layer formed between the thin Eu2O3 film and the YSZ(001) substrate. Thus, our work uncovers another potential source of vibrational anomalies in thin films and multilayers, which has to be cautiously considered.
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Affiliation(s)
- Svetoslav Stankov
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology D-76344 Eggenstein-Leopoldshafen Germany +49 (0)721 608-26 172 +49 (0)721 608-28 680
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology D-76131 Karlsruhe Germany
| | - Dániel G Merkel
- Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences H-1525 Budapest Hungary
- Centre for Energy Research POB 49 H-1525 Budapest Hungary
| | - Jochen Kalt
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology D-76344 Eggenstein-Leopoldshafen Germany +49 (0)721 608-26 172 +49 (0)721 608-28 680
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology D-76131 Karlsruhe Germany
| | - Jörg Göttlicher
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology D-76344 Eggenstein-Leopoldshafen Germany +49 (0)721 608-26 172 +49 (0)721 608-28 680
| | - Jan Łażewski
- Institute of Nuclear Physics, Polish Academy of Sciences PL-31342 Kraków Poland
| | - Małgorzata Sternik
- Institute of Nuclear Physics, Polish Academy of Sciences PL-31342 Kraków Poland
| | - Paweł T Jochym
- Institute of Nuclear Physics, Polish Academy of Sciences PL-31342 Kraków Poland
| | - Przemysław Piekarz
- Institute of Nuclear Physics, Polish Academy of Sciences PL-31342 Kraków Poland
| | - Tilo Baumbach
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology D-76344 Eggenstein-Leopoldshafen Germany +49 (0)721 608-26 172 +49 (0)721 608-28 680
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology D-76131 Karlsruhe Germany
| | | | - Rudolf Rüffer
- ESRF-The European Synchrotron F-38043 Grenoble France
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9
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Łażewski J, Sternik M, Jochym PT, Kalt J, Stankov S, Chumakov AI, Göttlicher J, Rüffer R, Baumbach T, Piekarz P. Lattice Dynamics and Structural Phase Transitions in Eu 2O 3. Inorg Chem 2021; 60:9571-9579. [PMID: 34143607 PMCID: PMC8277167 DOI: 10.1021/acs.inorgchem.1c00708] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
![]()
Using the density
functional theory, we study the structural and
lattice dynamical properties of europium sesquioxide (Eu2O3) in the cubic, trigonal, and monoclinic phases. The
obtained lattice parameters and energies of the Raman modes show a
good agreement with the available experimental data. The Eu-partial
phonon density of states calculated for the cubic structure is compared
with the nuclear inelastic scattering data obtained from a 20 nm thick
Eu2O3 film deposited on a YSZ substrate. A small
shift of the experimental spectrum to higher energies results from
a compressive strain induced by the substrate. On the basis of lattice
and phonon properties, we analyze the mechanisms of structural transitions
between different phases of Eu2O3. The phase transitions of rare-earth sesquioxide
Eu2O3 are very complicated. Analyzing dynamical
properties
of this compound for experimentally observed C-, A-, and B-type phases
and extracting key symmetry elements common for these phases, we describe
transition mechanisms and their sequence. Our DFT first-principles
predictions are supported by the nuclear inelastic scattering measurements.
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Affiliation(s)
- Jan Łażewski
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Małgorzata Sternik
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Paweł T Jochym
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
| | - Jochen Kalt
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany.,Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | - Svetoslav Stankov
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany.,Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | | | - Jorg Göttlicher
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | - Rudolf Rüffer
- ESRF-The European Synchrotron, Grenoble 38043, France
| | - Tilo Baumbach
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany.,Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | - Przemysław Piekarz
- Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
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10
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Bonadiman C, Brombin V, Andreozzi GB, Benna P, Coltorti M, Curetti N, Faccini B, Merli M, Pelorosso B, Stagno V, Tesauro M, Pavese A. Phlogopite-pargasite coexistence in an oxygen reduced spinel-peridotite ambient. Sci Rep 2021; 11:11829. [PMID: 34088914 PMCID: PMC8178368 DOI: 10.1038/s41598-021-90844-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 05/04/2021] [Indexed: 02/04/2023] Open
Abstract
The occurrence of phlogopite and amphibole in mantle ultramafic rocks is widely accepted as the modal effect of metasomatism in the upper mantle. However, their simultaneous formation during metasomatic events and the related sub-solidus equilibrium with the peridotite has not been extensively studied. In this work, we discuss the geochemical conditions at which the pargasite-phlogopite assemblage becomes stable, through the investigation of two mantle xenoliths from Mount Leura (Victoria State, Australia) that bear phlogopite and the phlogopite + amphibole (pargasite) pair disseminated in a harzburgite matrix. Combining a mineralogical study and thermodynamic modelling, we predict that the P-T locus of the equilibrium reaction pargasite + forsterite = Na-phlogopite + 2 diopside + spinel, over the range 1.3-3.0 GPa/540-1500 K, yields a negative Clapeyron slope of -0.003 GPa K-1 (on average). The intersection of the P-T locus of supposed equilibrium with the new mantle geotherm calculated in this work allowed us to state that the Mount Leura xenoliths achieved equilibrium at 2.3 GPa /1190 K, that represents a plausible depth of ~ 70 km. Metasomatic K-Na-OH rich fluids stabilize hydrous phases. This has been modelled by the following equilibrium equation: 2 (K,Na)-phlogopite + forsterite = 7/2 enstatite + spinel + fluid (components: Na2O,K2O,H2O). Using quantum-mechanics, semi-empirical potentials, lattice dynamics and observed thermo-elastic data, we concluded that K-Na-OH rich fluids are not effective metasomatic agents to convey alkali species across the upper mantle, as the fluids are highly reactive with the ultramafic system and favour the rapid formation of phlogopite and amphibole. In addition, oxygen fugacity estimates of the Mount Leura mantle xenoliths [Δ(FMQ) = -1.97 ± 0.35; -1.83 ± 0.36] indicate a more reducing mantle environment than what is expected from the occurrence of phlogopite and amphibole in spinel-bearing peridotites. This is accounted for by our model of full molecular dissociation of the fluid and incorporation of the O-H-K-Na species into (OH)-K-Na-bearing mineral phases (phlogopite and amphibole), that leads to a peridotite metasomatized ambient characterized by reduced oxygen fugacity.
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Affiliation(s)
- Costanza Bonadiman
- grid.8484.00000 0004 1757 2064Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, 44122 Ferrara, Italy ,Istituto di Geologia Ambientale e Geoingegneria del Consiglio Nazionale delle Ricerche (IGAG-CNR), Via Salaria km 29, 300, 00015 Montelibretti, Italy ,Istituto di Geoscienze e Georisorse del Consiglio Nazionale delle Ricerche (CNR-IGG-CNR), Via G. Moruzzi 1, 56124 Pisa, Italy
| | - Valentina Brombin
- grid.8484.00000 0004 1757 2064Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, 44122 Ferrara, Italy ,Istituto di Geologia Ambientale e Geoingegneria del Consiglio Nazionale delle Ricerche (IGAG-CNR), Via Salaria km 29, 300, 00015 Montelibretti, Italy
| | - Giovanni B. Andreozzi
- grid.7841.aDipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Piera Benna
- grid.7605.40000 0001 2336 6580Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso 35, 10100 Turin, Italy
| | - Massimo Coltorti
- grid.8484.00000 0004 1757 2064Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
| | - Nadia Curetti
- grid.7605.40000 0001 2336 6580Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso 35, 10100 Turin, Italy
| | - Barbara Faccini
- grid.8484.00000 0004 1757 2064Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
| | - Marcello Merli
- grid.10776.370000 0004 1762 5517Dipartimento di Scienze della Terra e del Mare (DiSTeM), Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Beatrice Pelorosso
- grid.8484.00000 0004 1757 2064Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
| | - Vincenzo Stagno
- grid.7841.aDipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Magdala Tesauro
- grid.5133.40000 0001 1941 4308Dipartimento di Matematica e Geoscienze, Università di Trieste, Via Weiss 2, 34128 Trieste, Italy ,grid.5477.10000000120346234Department of Earth Sciences, Utrecht University, Princetonlaan 8a, Utrecht, 3584 CB The Netherlands
| | - Alessandro Pavese
- grid.7605.40000 0001 2336 6580Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso 35, 10100 Turin, Italy
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11
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Caporaletti F, Capaccioli S, Valenti S, Mikolasek M, Chumakov AI, Monaco G. Experimental evidence of mosaic structure in strongly supercooled molecular liquids. Nat Commun 2021; 12:1867. [PMID: 33767148 PMCID: PMC7994800 DOI: 10.1038/s41467-021-22154-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 02/25/2021] [Indexed: 11/25/2022] Open
Abstract
When a liquid is cooled to produce a glass its dynamics, dominated by the structural relaxation, become very slow, and at the glass-transition temperature Tg its characteristic relaxation time is about 100 s. At slightly elevated temperatures (~1.2 Tg) however, a second process known as the Johari-Goldstein relaxation, βJG, decouples from the structural one and remains much faster than it down to Tg. While it is known that the βJG-process is strongly coupled to the structural relaxation, its dedicated role in the glass-transition remains under debate. Here we use an experimental technique that permits us to investigate the spatial and temporal properties of the βJG relaxation, and give evidence that the molecules participating in it are highly mobile and spatially connected in a system-spanning, percolating cluster. This correlation of structural and dynamical properties provides strong experimental support for a picture, drawn from theoretical studies, of an intermittent mosaic structure in the deeply supercooled liquid phase. The Johari-Goldstein relaxation is a precursor of the glass transition in liquids. Caporaletti et al. use time-dependent interferometry data to substantiate its suggested structural appearance as a globally percolating, fluctuating mosaic.
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Affiliation(s)
- F Caporaletti
- Dipartimento di Fisica, Università di Trento, Povo (Trento), Italy. .,Van der Waals-Zeeman Institute, Institute of Physics/Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, the Netherlands.
| | - S Capaccioli
- Dipartimento di Fisica, Università di Pisa, Pisa, Italy.,CISUP, Centro per l'Integrazione della Strumentazione dell'Università di Pisa, Pisa, Italy
| | - S Valenti
- Department of Physics, Universitat Politécnica de Catalunya, Barcelona, Spain
| | - M Mikolasek
- ESRF-The European Synchrotron, CS40220, Grenoble Cedex 9, France
| | - A I Chumakov
- ESRF-The European Synchrotron, CS40220, Grenoble Cedex 9, France.,National Research Center 'Kurchatov Institute', Moscow, Russia
| | - G Monaco
- Dipartimento di Fisica, Università di Trento, Povo (Trento), Italy. .,Dipartimento di Fisica ed Astronomia, Università di Padova, Padova, Italy.
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12
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Abstract
Coherent control of quantum dynamics is key to a multitude of fundamental studies and applications1. In the visible or longer-wavelength domains, near-resonant light fields have become the primary tool with which to control electron dynamics2. Recently, coherent control in the extreme-ultraviolet range was demonstrated3, with a few-attosecond temporal resolution of the phase control. At hard-X-ray energies (above 5–10 kiloelectronvolts), Mössbauer nuclei feature narrow nuclear resonances due to their recoilless absorption and emission of light, and spectroscopy of these resonances is widely used to study the magnetic, structural and dynamical properties of matter4,5. It has been shown that the power and scope of Mössbauer spectroscopy can be greatly improved using various control techniques6–16. However, coherent control of atomic nuclei using suitably shaped near-resonant X-ray fields remains an open challenge. Here we demonstrate such control, and use the tunable phase between two X-ray pulses to switch the nuclear exciton dynamics between coherent enhanced excitation and coherent enhanced emission. We present a method of shaping single pulses delivered by state-of-the-art X-ray facilities into tunable double pulses, and demonstrate a temporal stability of the phase control on the few-zeptosecond timescale. Our results unlock coherent optical control for nuclei, and pave the way for nuclear Ramsey spectroscopy17 and spin-echo-like techniques, which should not only advance nuclear quantum optics18, but also help to realize X-ray clocks and frequency standards19. In the long term, we envision time-resolved studies of nuclear out-of-equilibrium dynamics, which is a long-standing challenge in Mössbauer science20. Suitably shaped X-ray pulses are used to coherently steer the quantum dynamics of atoms’ nuclei rather than their electrons, with few-zeptosecond temporal stability of the phase control.
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13
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Brumund P, Reyes-Herrera J, Detlefs C, Morawe C, Sanchez Del Rio M, Chumakov AI. Design simulations of a horizontally deflecting high-heat-load monochromator. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:91-103. [PMID: 33399557 DOI: 10.1107/s1600577520014009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 10/20/2020] [Indexed: 06/12/2023]
Abstract
The performance of a liquid-nitrogen-cooled high-heat-load monochromator with a horizontal scattering plane has been analysed, aiming to preserve the high quality of the X-ray beam in the vertical plane for downstream optics. Using finite-element analysis, height profiles of the crystal surface for various heat loads and the corresponding slope errors in the meridional and sagittal planes were calculated. Then the angular distortions of the reflected beam in both meridional and sagittal planes were calculated analytically and also modelled by ray tracing, revealing a good agreement of the two approaches. The results show that with increasing heat load in the crystal the slope errors of the crystal surface reach their smallest values first in the sagittal and then in the meridional plane. For the considered case of interest at a photon energy of 14.412 keV and the Si(111) reflection with a Bragg angle of 7.88°, the angular distortions of the reflected beam in the sagittal plane are an order of magnitude smaller than in the meridional one. Furthermore, they are smaller than the typical angular size of the beam source at the monochromator position. For a high-heat-load monochromator operating in the horizontal scattering plane, the sagittal angular distortions of the reflected beam appear in the vertical plane. Thus, such an instrument perfectly preserves the high quality of the X-ray beam in the vertical plane for downstream optics. Compared with vertical scattering, the throughput of the monochromatic beam with the horizontal scattering plane is reduced by only 3.3% for the new EBS source, instead of 34.3% for the old ESRF-1 machine. This identifies the horizontal-scattering high-heat-load monochromator as a device essentially free of the heat-load effects in the vertical plane and without significant loss in terms of throughput.
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Affiliation(s)
- Philipp Brumund
- ESRF - The European Synchrotron, 38043 Grenoble Cedex 9, France
| | | | - Carsten Detlefs
- ESRF - The European Synchrotron, 38043 Grenoble Cedex 9, France
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14
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Schulze KS, Loetzsch R, Rüffer R, Uschmann I, Röhlsberger R, Paulus GG. X-ray dichroism in polyimide caused by non-resonant scattering. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:176-180. [PMID: 33399566 PMCID: PMC7842229 DOI: 10.1107/s1600577520015568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
Dichroism is one of the most important optical effects in both the visible and the X-ray range. Besides absorption, scattering can also contribute to dichroism. This paper demonstrates that, based on the example of polyimide, materials can show tiny dichroism even far from electronic resonances due to scattering. Although the effect is small, it can lead to a measurable polarization change and might have influence on highly sensitive polarimetric experiments.
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Affiliation(s)
- K. S. Schulze
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
| | - R. Loetzsch
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - R. Rüffer
- ESRF – The European Synchrotron, CS 40220, 38043 Grenoble Cedex 9, France
| | - I. Uschmann
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
| | - R. Röhlsberger
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
- GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany
- Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - G. G. Paulus
- Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
- Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
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15
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Lyubutin I, Starchikov S, Troyan I, Nikiforova Y, Lyubutina M, Gavriliuk A. Pressure Induced Spin Crossover and Magnetic Properties of Multiferroic Ba 3NbFe 3Si 2O 14. Molecules 2020; 25:molecules25173808. [PMID: 32825707 PMCID: PMC7504703 DOI: 10.3390/molecules25173808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 08/15/2020] [Accepted: 08/19/2020] [Indexed: 12/03/2022] Open
Abstract
Recently, the iron containing langasite-type crystal Ba3NbFe3Si2O14 has attracted great attention as a new magnetically induced multiferroic. In this work, magnetic, structural and electronic properties of the multiferroic Ba3NbFe3Si2O14 were investigated by several methods, including synchrotron X-ray diffraction, Raman spectroscopy and synchrotron Mössbauer source technique at high quasi-hydrostatic pressures (up to 70 GPa), created in diamond anvil cells. At room temperature, two structural transitions at pressures of about 3.0 and 17.5 GPa were detected. Mössbauer studies at high pressures revealed a radical change in the magnetic properties during structural transitions. At pressures above 18 GPa, the crystal transforms into two magnetic fractions, and in one of them the Néel temperature (TN) increases by about four times compared with the TN value in the initial phase (from 27 to 115 K). At pressures above 50 GPa, a spin crossover occurs when the fraction of iron Fe3+ ions in oxygen octahedra transits from the high-spin (HS, S = 5/2) to the low-spin (LS, S = 1/2) state. This leads to a new change in the magnetic properties. The magnetic ordering temperature of the LS sublattice was found to be of about 22(1) K, and magnetic correlations between HS and LS sublattices were studied.
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Affiliation(s)
- Igor Lyubutin
- Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia; (I.L.); (I.T.); (Y.N.); (M.L.); (A.G.)
| | - Sergey Starchikov
- Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia; (I.L.); (I.T.); (Y.N.); (M.L.); (A.G.)
- Correspondence: ; Tel.: +7-499-330-8329
| | - Ivan Troyan
- Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia; (I.L.); (I.T.); (Y.N.); (M.L.); (A.G.)
| | - Yulia Nikiforova
- Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia; (I.L.); (I.T.); (Y.N.); (M.L.); (A.G.)
| | - Marianna Lyubutina
- Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia; (I.L.); (I.T.); (Y.N.); (M.L.); (A.G.)
| | - Alexander Gavriliuk
- Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, 119333 Moscow, Russia; (I.L.); (I.T.); (Y.N.); (M.L.); (A.G.)
- Institute for Nuclear Research, Russian Academy of Sciences, Troitsk, 142190 Moscow, Russia
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16
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Klein RA, Walsh JPS, Clarke SM, Liu Z, Alp EE, Bi W, Meng Y, Altman AB, Chow P, Xiao Y, Norman MR, Rondinelli JM, Jacobsen SD, Puggioni D, Freedman DE. Pressure-Induced Collapse of Magnetic Order in Jarosite. PHYSICAL REVIEW LETTERS 2020; 125:077202. [PMID: 32857531 DOI: 10.1103/physrevlett.125.077202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 07/21/2020] [Indexed: 06/11/2023]
Abstract
We report a pressure-induced phase transition in the frustrated kagomé material jarosite at ∼45 GPa, which leads to the disappearance of magnetic order. Using a suite of experimental techniques, we characterize the structural, electronic, and magnetic changes in jarosite through this phase transition. Synchrotron powder x-ray diffraction and Fourier transform infrared spectroscopy experiments, analyzed in aggregate with the results from density functional theory calculations, indicate that the material changes from a R3[over ¯]m structure to a structure with a R3[over ¯]c space group. The resulting phase features a rare twisted kagomé lattice in which the integrity of the equilateral Fe^{3+} triangles persists. Based on symmetry arguments we hypothesize that the resulting structural changes alter the magnetic interactions to favor a possible quantum paramagnetic phase at high pressure.
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Affiliation(s)
- Ryan A Klein
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - James P S Walsh
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - Samantha M Clarke
- Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550, USA
| | - Zhenxian Liu
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - E Ercan Alp
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA
| | - Wenli Bi
- Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - Yue Meng
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Alison B Altman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - Paul Chow
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Yuming Xiao
- HPCAT, X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M R Norman
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Steven D Jacobsen
- Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 60208, USA
| | - Danilo Puggioni
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Danna E Freedman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
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17
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Cucinotta G, Poggini L, Giaconi N, Cini A, Gonidec M, Atzori M, Berretti E, Lavacchi A, Fittipaldi M, Chumakov AI, Rüffer R, Rosa P, Mannini M. Space Charge-Limited Current Transport Mechanism in Crossbar Junction Embedding Molecular Spin Crossovers. ACS APPLIED MATERIALS & INTERFACES 2020; 12:31696-31705. [PMID: 32551478 PMCID: PMC8008390 DOI: 10.1021/acsami.0c07445] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
Spin crossover complexes are among the most studied classes of molecular switches and have attracted considerable attention for their potential technological use as active units in multifunctional devices. A fundamental step toward their practical implementation is the integration in macroscopic devices adopting hybrid vertical architectures. First, the physical properties of technological interest shown by these materials in the bulk phase have to be retained once they are deposited on a solid surface. Herein, we describe the study of a hybrid molecular inorganic junction embedding the spin crossover complex [Fe(qnal)2] (qnal = quinoline-naphthaldehyde) as an active switchable thin film sandwiched within energy-optimized metallic electrodes. In these junctions, developed and characterized with the support of state of the art techniques including synchrotron Mössbauer source (SMS) spectroscopy and focused-ion beam scanning transmission electron microscopy, we observed that the spin state conversion of the Fe(II)-based spin crossover film is associated with a transition from a space charge-limited current (SCLC) transport mechanism with shallow traps to a SCLC mechanism characterized by the presence of an exponential distribution of traps concomitant with the spin transition temperature.
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Affiliation(s)
- Giuseppe Cucinotta
- Department of Chemistry
“U. Schiff” and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino, FI 50019, Italy
| | - Lorenzo Poggini
- Department of Chemistry
“U. Schiff” and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino, FI 50019, Italy
- CNRS, University of Bordeaux, ICMCB, UMR 5026, Pessac 33600, France
| | - Niccolò Giaconi
- Department of Chemistry
“U. Schiff” and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino, FI 50019, Italy
| | - Alberto Cini
- Department of Physics and Astronomy and
INSTM Research Unit, University of Florence, Via Sansone 1, Sesto Fiorentino, FI 50019, Italy
| | - Mathieu Gonidec
- CNRS, University of Bordeaux, ICMCB, UMR 5026, Pessac 33600, France
| | - Matteo Atzori
- Department of Chemistry
“U. Schiff” and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino, FI 50019, Italy
| | - Enrico Berretti
- Institute for Chemistry of OrganoMetallic
Compounds (ICCOM-CNR), Via Madonna del Piano, Sesto Fiorentino, FI 50019, Italy
| | - Alessandro Lavacchi
- Institute for Chemistry of OrganoMetallic
Compounds (ICCOM-CNR), Via Madonna del Piano, Sesto Fiorentino, FI 50019, Italy
| | - Maria Fittipaldi
- Department of Physics and Astronomy and
INSTM Research Unit, University of Florence, Via Sansone 1, Sesto Fiorentino, FI 50019, Italy
| | | | - Rudolf Rüffer
- ESRF-The European Synchrotron, Avenue des Martyrs 71, Grenoble 38000, France
| | - Patrick Rosa
- CNRS, University of Bordeaux, ICMCB, UMR 5026, Pessac 33600, France
| | - Matteo Mannini
- Department of Chemistry
“U. Schiff” and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino, FI 50019, Italy
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18
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Cini A, Poggini L, Chumakov AI, Rüffer R, Spina G, Wattiaux A, Duttine M, Gonidec M, Fittipaldi M, Rosa P, Mannini M. Synchrotron-based Mössbauer spectroscopy characterization of sublimated spin crossover molecules. Phys Chem Chem Phys 2020; 22:6626-6637. [PMID: 32159166 DOI: 10.1039/c9cp04464g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The spin crossover (SCO) efficiency of [57Fe(bpz)2(phen)] (where bpz = bis(pyrazol-1-yl)borohydride and phen = 9,10-phenantroline) molecules deposited on gold substrates was investigated by means of synchrotron Mössbauer spectroscopy. The spin transition was driven thermally, or light induced via the LIESST (light induced excited spin-state trapping) effect. Both sets of measurements show that, once deposited on a gold substrate, the efficiency of the SCO mechanism is modified with respect to molecules in the bulk phase. A correlation in the distribution of hyperfine parameters in the sublimated films, not evidenced so far in the bulk phase, is reported. This translates into geometrical distortions of the first coordination sphere of the iron atom that seem to correlate with the decreased spin conversion. The work reported clearly shows the potentiality of synchrotron Mössbauer spectroscopy for the characterization of nanostructured Fe-based SCO systems, thus resulting as a key tool in view of their applications in innovative nanoscale devices.
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Affiliation(s)
- Alberto Cini
- Department of Physics and Astronomy, University of Florence and INSTM Research Unit of Florence, via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.
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19
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Collings IE, Saines PJ, Mikolasek M, Boffa Ballaran T, Hanfland M. Static disorder in a perovskite mixed-valence metal–organic framework. CrystEngComm 2020. [DOI: 10.1039/d0ce00119h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Effects of A-site and M-site substitutions on the structural properties of perovskite dimethylammonium iron formate.
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Affiliation(s)
- Ines E. Collings
- Center for X-ray Analytics
- Swiss Federal Laboratories for Materials Science and Technology
- 8600 Dübendorf
- Switzerland
- European Synchrotron Radiation Facility
| | - Paul J. Saines
- School of Physical Sciences
- University of Kent
- Canterbury
- UK
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20
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Mebs S, Srinivas V, Kositzki R, Griese JJ, Högbom M, Haumann M. Fate of oxygen species from O 2 activation at dimetal cofactors in an oxidase enzyme revealed by 57Fe nuclear resonance X-ray scattering and quantum chemistry. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2019; 1860:148060. [PMID: 31394094 DOI: 10.1016/j.bbabio.2019.148060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 07/30/2019] [Accepted: 08/02/2019] [Indexed: 10/26/2022]
Abstract
Oxygen (O2) activation is a central challenge in chemistry and catalyzed at prototypic dimetal cofactors in biological enzymes with diverse functions. Analysis of intermediates is required to elucidate the reaction paths of reductive O2 cleavage. An oxidase protein from the bacterium Geobacillus kaustophilus, R2lox, was used for aerobic in-vitro reconstitution with only 57Fe(II) or Mn(II) plus 57Fe(II) ions to yield [FeFe] or [MnFe] cofactors under various oxygen and solvent isotopic conditions including 16/18O and H/D exchange. 57Fe-specific X-ray scattering techniques were employed to collect nuclear forward scattering (NFS) and nuclear resonance vibrational spectroscopy (NRVS) data of the R2lox proteins. NFS revealed Fe/Mn(III)Fe(III) cofactor states and Mössbauer quadrupole splitting energies. Quantum chemical calculations of NRVS spectra assigned molecular structures, vibrational modes, and protonation patterns of the cofactors, featuring a terminal water (H2O) bound at iron or manganese in site 1 and a metal-bridging hydroxide (μOH-) ligand. A procedure for quantitation and correlation of experimental and computational NRVS difference signals due to isotope labeling was developed. This approach revealed that the protons of the ligands as well as the terminal water at the R2lox cofactors exchange with the bulk solvent whereas 18O from 18O2 cleavage is incorporated in the hydroxide bridge. In R2lox, the two water molecules from four-electron O2 reduction are released in a two-step reaction to the solvent. These results establish combined NRVS and QM/MM for tracking of iron-based oxygen activation in biological and chemical catalysts and clarify the reductive O2 cleavage route in an enzyme.
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Affiliation(s)
- Stefan Mebs
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Vivek Srinivas
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16, 10691 Stockholm, Sweden
| | - Ramona Kositzki
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Julia J Griese
- Department of Cell and Molecular Biology, Structural Biology, Uppsala University, Box 596, 75124 Uppsala, Sweden
| | - Martin Högbom
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16, 10691 Stockholm, Sweden
| | - Michael Haumann
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
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21
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Hochdörffer T, Chumakov AI, Wille HC, Schünemann V, Wolny JA. Vibrational properties and cooperativity of the 3D spin crossover network [Fe(pyrazine)][Pt(CN) 4]. Dalton Trans 2019; 48:15625-15634. [PMID: 31418431 DOI: 10.1039/c9dt02139f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Nuclear inelastic scattering of synchrotron radiation has been used to determine the phonon density of vibrational states (pDOS) for the high-spin and low-spin phases of the hydrated and dehydrated isomer of the spin crossover polymer [Fe(pyrazine)][Pt(CN)4]. Density functional theory calculations have been performed for molecular models of the 3D polymeric system. The models contain 15 Fe(ii)/Zn(ii) centres and allowed the assignment of the observed bands to the corresponding vibrational modes. Thermodynamic parameters like the mean force constant and the vibrational entropy but also sound velocities of the molecular lattices in both spin states have been derived from the pDOS. Modelling of the low-spin and high-spin centres in the environment or matrix of different spins has revealed the enthalpic and entropic components of the intramolecular cooperativity. In contrast to the 1D spin crossover systems (Rackwitz, et al., Phys. Chem. Chem. Phys., 2013, 15, 15450) based on the rigid 1,2,4-triazole derivatives the distortion of the low-spin iron Fe(ii) centre by the matrix of high-spin Fe(ii) (modelled as Zn(ii)) occurs only in two dimensions, defined by the [M(CN)4]2- sheets, rather than concerning all six Fe-N bonds, as in 1D systems. The enthalpic intramolecular cooperativity has been determined to be 15 kJ mol-1 which is lower than that in 1D systems (20-30 kJ mol-1). Yet, the entropic contribution stabilizes the low-spin state in a low-spin matrix, a behaviour which is opposite to what was found for the 1D systems.
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Affiliation(s)
- Tim Hochdörffer
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
| | | | | | - Volker Schünemann
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
| | - Juliusz A Wolny
- Department of Physics, Technische Universität Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern, Germany.
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22
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Goerttler S, Heeg K, Kaldun A, Reiser P, Strohm C, Haber J, Ott C, Subramanian R, Röhlsberger R, Evers J, Pfeifer T. Time-Resolved sub-Ångström Metrology by Temporal Phase Interferometry near X-Ray Resonances of Nuclei. PHYSICAL REVIEW LETTERS 2019; 123:153902. [PMID: 31702302 DOI: 10.1103/physrevlett.123.153902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Indexed: 06/10/2023]
Abstract
We introduce an analytical phase-reconstruction principle that retrieves atomic scale motion via time-domain interferometry. The approach is based on a resonant interaction with high-frequency light and does not require temporal resolution on the time scale of the resonance period. It is thus applicable to hard x rays and γ rays for measurements of extremely small spatial displacements or relative-frequency changes. Here, it is applied to retrieve the temporal phase of a 14.4 keV emission line of an ^{57}Fe sample, which corresponds to a spatial translation of this sample. The small wavelength of this transition (λ=0.86 Å) allows for determining the motion of the emitter on sub-Ångström length and nanosecond timescales.
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Affiliation(s)
| | - Kilian Heeg
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - Andreas Kaldun
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - Patrick Reiser
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | | | - Johann Haber
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - Christian Ott
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | | | - Ralf Röhlsberger
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
- The Hamburg Center for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Jörg Evers
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - Thomas Pfeifer
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
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23
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Caporaletti F, Capaccioli S, Valenti S, Mikolasek M, Chumakov AI, Monaco G. A microscopic look at the Johari-Goldstein relaxation in a hydrogen-bonded glass-former. Sci Rep 2019; 9:14319. [PMID: 31586113 PMCID: PMC6778113 DOI: 10.1038/s41598-019-50824-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 09/03/2019] [Indexed: 11/23/2022] Open
Abstract
Understanding the glass transition requires getting the picture of the dynamical processes that intervene in it. Glass-forming liquids show a characteristic decoupling of relaxation processes when they are cooled down towards the glassy state. The faster (βJG) process is still under scrutiny, and its full explanation necessitates information at the microscopic scale. To this aim, nuclear γ-resonance time-domain interferometry (TDI) has been utilized to investigate 5-methyl-2-hexanol, a hydrogen-bonded liquid with a pronounced βJG process as measured by dielectric spectroscopy. TDI probes in fact the center-of-mass, molecular dynamics at scattering-vectors corresponding to both inter- and intra-molecular distances. Our measurements demonstrate that, in the undercooled liquid phase, the βJG relaxation can be visualized as a spatially-restricted rearrangement of molecules within the cage of their closest neighbours accompanied by larger excursions which reach out at least the inter-molecular scale and are related to cage-breaking events. In-cage rattling and cage-breaking processes therefore coexist in the βJG relaxation.
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Affiliation(s)
- F Caporaletti
- Dipartimento di Fisica, Università di Trento, I-38123, Povo, Trento, Italy.
| | - S Capaccioli
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy
| | - S Valenti
- Grup de Caracterització de Materials, Department of Physics, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019, Barcelona, Spain
| | - M Mikolasek
- ESRF-The European Synchrotron, CS40 220, 38043, Grenoble, Cedex 9, France
| | - A I Chumakov
- ESRF-The European Synchrotron, CS40 220, 38043, Grenoble, Cedex 9, France
- National Research Center "Kurchatov Institute", 123182, Moscow, Russia
| | - G Monaco
- Dipartimento di Fisica, Università di Trento, I-38123, Povo, Trento, Italy.
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24
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Chumakov AI, Shvyd'ko Y, Sergueev I, Bessas D, Rüffer R. Hard-X-Ray Spectroscopy with a Spectrographic Approach. PHYSICAL REVIEW LETTERS 2019; 123:097402. [PMID: 31524474 DOI: 10.1103/physrevlett.123.097402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Indexed: 06/10/2023]
Abstract
Hard-x-ray spectroscopy relies on a suite of modern techniques for studies of vibrational, electronic, and magnetic excitations in condensed matter. At present, the energy resolution of these techniques can be improved only by decreasing the spectral window of the involved optics-monochromators and analyzers-thereby sacrificing the intensity. Here, we demonstrate hard-x-ray spectroscopy with greatly improved energy resolution without narrowing the spectral window by adapting principles of spectrographic imaging to the hard-x-ray regime. Similar to Newton's classical prism, the hard-x-ray spectrograph disperses different "colors"-i.e., energies-of x-ray photons in space. Then, selecting each energy component with a slit ensures high energy resolution, whereas measuring x-ray spectra with all components of a broad spectral window keeps the intensity. We employ the principles of spectrographic imaging for phonon spectroscopy. Here the new approach revealed anomalous soft atomic dynamics in α-iron, a phenomenon which was not previously reported in the literature. We argue that hard-x-ray spectrographic imaging also could be a path to discovering new physics in studies of electronic and magnetic excitations.
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Affiliation(s)
| | - Yuri Shvyd'ko
- Advanced Photon Source, Argonne National Laboratory, Lemont, 60439 Illinois, USA
| | - Ilya Sergueev
- Deutsches Elektronen Synchrotron, D-22607 Hamburg, Germany
| | | | - Rudolf Rüffer
- ESRF-The European Synchrotron, F-38043 Grenoble, France
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25
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Samoylova L, Boesenberg U, Chumakov A, Kaganer V, Petrov I, Roth T, Rüffer R, Sinn H, Terentyev S, Madsen A. Diffraction properties of a strongly bent diamond crystal used as a dispersive spectrometer for XFEL pulses. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1069-1072. [PMID: 31274429 DOI: 10.1107/s1600577519004880] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
Self-amplified spontaneous emission (SASE) enables X-ray free-electron lasers (XFELs) to generate hard X-ray pulses of sub-100 fs duration. However, due to the stochastic nature of SASE, the energy spectrum fluctuates from pulse to pulse. Many experiments that employ XFEL radiation require the resolution of the spectrum of each pulse. The work presented here investigates the capacity of a thin strongly bent diamond crystal to resolve the energy spectra of hard X-ray SASE pulses by studying its diffraction properties. Rocking curves of the symmetric C*(440) reflection have been measured for different bending radii. The experimental data match the theoretical modelling based on the Takagi-Taupin equations of dynamical diffraction. A uniform strain gradient has proven to be a valid model of strain deformations in the crystal.
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Affiliation(s)
- Liubov Samoylova
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - Ulrike Boesenberg
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - Aleksandr Chumakov
- ESRF - The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - Vladimir Kaganer
- Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
| | - Ilia Petrov
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - Thomas Roth
- ESRF - The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - Rudolf Rüffer
- ESRF - The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - Harald Sinn
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - Sergey Terentyev
- TISNCM - Technological Institute for Superhard and Novel Carbon Materials, 142190 Moscow, Russia
| | - Anders Madsen
- European X-ray Free-Electron Laser Facility, Holzkoppel 4, D-22869 Schenefeld, Germany
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26
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Vrba V, Procházka V, Miglierini M. Identification of spatial magnetic inhomogeneities by nuclear forward scattering of synchrotron radiation. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1310-1315. [PMID: 31274459 DOI: 10.1107/s1600577519005344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 04/18/2019] [Indexed: 06/09/2023]
Abstract
Spatially confined magnetic inhomogeneities were revealed by measuring nuclear forward scattering time spectra on the same sample in two different geometric arrangements. They differ by 180° rotation of the sample around one of the polarization axes. A basic theoretical description of this phenomenon and its relation to a spatial distribution of nuclei featuring different magnetic moments is provided. From an experimental point of view, the violation of rotational invariance was observed for an inhomogeneous Fe81Mo8Cu1B10 metallic glass. The development of magnetic inhomogeneities and their relation to the evolution of time spectra was studied during thermal annealing.
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Affiliation(s)
- Vlastimil Vrba
- Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17 listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Vít Procházka
- Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17 listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Marcel Miglierini
- Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, Ilkovičova 3, 812 19 Bratislava, Slovakia
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27
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Pradip R, Piekarz P, Merkel DG, Kalt J, Waller O, Chumakov AI, Rüffer R, Oleś AM, Parlinski K, Baumbach T, Stankov S. Phonon confinement and spin-phonon coupling in tensile-strained ultrathin EuO films. NANOSCALE 2019; 11:10968-10976. [PMID: 31139805 DOI: 10.1039/c9nr01931f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Reducing the material sizes to the nanometer length scale leads to drastic modifications of the propagating lattice excitations (phonons) and their interactions with electrons and magnons. In EuO, a promising material for spintronic applications in which a giant spin-phonon interaction is present, this might imply a reduction of the degree of spin polarization in thin films. Therefore, a comprehensive investigation of the lattice dynamics and spin-phonon interaction in EuO films is necessary for practical applications. We report a systematic lattice dynamics study of ultrathin EuO(001) films using nuclear inelastic scattering on the Mössbauer-active isotope 151Eu and first-principles theory. The films were epitaxially grown on YAlO3(110), which induces a tensile strain of ca. 2%. By reducing the EuO layer thickness from 8 nm to a sub-monolayer coverage, the Eu-partial phonon density of states (PDOS) reveals a gradual enhancement of the number of low-energy phonon states and simultaneous broadening and suppression of the peaks. These deviations from bulk features lead to significant anomalies in the vibrational thermodynamic and elastic properties calculated from the PDOS. The experimental results, supported by first-principles theory, unveil a reduction of the strength of the spin-phonon interaction in the tensile-strained EuO by a factor of four compared to a strain-free lattice.
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Affiliation(s)
- Ramu Pradip
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany.
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28
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Kupenko I, Aprilis G, Vasiukov DM, McCammon C, Chariton S, Cerantola V, Kantor I, Chumakov AI, Rüffer R, Dubrovinsky L, Sanchez-Valle C. Magnetism in cold subducting slabs at mantle transition zone depths. Nature 2019; 570:102-106. [DOI: 10.1038/s41586-019-1254-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 04/01/2019] [Indexed: 11/09/2022]
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29
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Magnetic and electronic properties of magnetite across the high pressure anomaly. Sci Rep 2019; 9:4464. [PMID: 30872759 PMCID: PMC6418096 DOI: 10.1038/s41598-019-41184-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 02/28/2019] [Indexed: 11/15/2022] Open
Abstract
The magnetite Fe3O4, being anciently known magnetic material to human kind and remaining in leading positions for development of advanced technologies presently, demonstrates a number of puzzling physical phenomena, being at focus of extensive research for more than century. Recently the pressure-induced anomalous behavior of physical properties of magnetite in vicinity of the structural phase transition, occurring at P ~ 25–30 GPa, has attracted particular attention, and its nature remains unclear. Here we study the magnetic and electronic properties of magnetite across high pressure anomaly and in the pressure-induced phase by means of 57Fe synchrotron Moessbauer spectroscopy and neutron diffraction. The hyperfine interaction parameters behavior was systematically analysed over pressure 0–40 GPa and temperature 10–290 K ranges. In the high pressure phase the ferrimagnetic order formation below TNP ~ 420 K was observed and spin arrangement symmetry was deduced. The structural, magnetic and electronic phase diagram of magnetite in the discussed pressure range is established.
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30
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Andreeva MA, Baulin RA, Repchenko YL. Standing wave approach in the theory of X-ray magnetic reflectivity. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:483-496. [PMID: 30855259 DOI: 10.1107/s1600577518018398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 12/28/2018] [Indexed: 06/09/2023]
Abstract
An extension of the exact X-ray resonant magnetic reflectivity theory has been developed, taking into account the small value of the magnetic terms in the X-ray susceptibility tensor. It is shown that squared standing waves (fourth power of the total electric field) determine the output of the magnetic addition to the total reflectivity from a magnetic multilayer. The obtained generalized kinematical approach essentially speeds up the calculation of the asymmetry ratio in the magnetic reflectivity. The developed approach easily explains the peculiarities of the angular dependence of the reflectivity with the rotated polarization (such as the peak at the critical angle of the total external reflection). The revealed dependence of the magnetic part of the total reflectivity on the squared standing waves means that the selection of the reflectivity with the rotated polarization ensures higher sensitivity to the depth profiles of magnetization than the secondary radiation at the specular reflection condition.
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Affiliation(s)
- M A Andreeva
- Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - R A Baulin
- Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Yu L Repchenko
- National Research Centre `Kurchatov Institute', Pl. Kurchatova 1, Moscow 123182, Russian Federation
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31
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Friedman Y, Steiner JM, Livshitz S, Perez E, Nowik I, Felner I, Wille HC, Wortmann G, Efrati O, Finkelstein A, Petitgirard S, Chumakov AI, Bessas D. The validity of an experiment testing the influence of acceleration on time dilation using a rotating Mössbauer absorber and a Synchrotron Mössbauer Source. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:473-482. [PMID: 30855258 DOI: 10.1107/s1600577519000857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 01/17/2019] [Indexed: 06/09/2023]
Abstract
Three experiments are reviewed, performed (in 2014-2016) at ID18 of ESRF to measure the influence of acceleration on time dilation by measuring the relative shift between the absorption lines of two states of the same rotating absorber with accelerations anti-parallel and parallel to the incident beam. Statistically significant data for rotation frequencies up to 510 Hz in both directions of rotation were collected. For each run with high rotation, a stable statistically significant `vibration-free' relative shift between the absorption lines of the two states was measured. This may indicate the influence of acceleration on time dilation. However, the measured relative shift was also affected by the use of a slit necessary to focus the beam to the axis of rotation to a focal spot of sub-micrometre size. The introduction of the slit broke the symmetry in the absorption lines due to the nuclear lighthouse effect and affected the measured relative shift, preventing to claim conclusively the influence of acceleration on time dilation. Assuming that this loss of symmetry is of first order, the zero value of the relative shift, corrected for this loss, falls always within the experimental error limits, as predicted by Einstein's clock hypothesis. The requirements and an indispensable plan for a conclusive experiment, once the improved technology becomes available, is presented. This will be useful to future experimentalists wishing to pursue this experiment or a related rotor experiment involving a Mössbauer absorber and a synchrotron Mössbauer source.
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Affiliation(s)
- Y Friedman
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - J M Steiner
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - S Livshitz
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - E Perez
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - I Nowik
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - I Felner
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - H C Wille
- Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany
| | - G Wortmann
- Department Physik, Universität Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany
| | - O Efrati
- Colibri Spindles Ltd, Industrial Park Lavon, Bikat Bet Hakerem, Israel
| | - A Finkelstein
- Colibri Spindles Ltd, Industrial Park Lavon, Bikat Bet Hakerem, Israel
| | - S Petitgirard
- Bayerisches Geo-Institut, Universitätsstrasse 30, 95447 Bayreuth, Germany
| | - A I Chumakov
- ESRF - The European Synchrotron, CS40220, 38043 Grenoble Cédex 9, France
| | - D Bessas
- ESRF - The European Synchrotron, CS40220, 38043 Grenoble Cédex 9, France
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32
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Mebs S, Duan J, Wittkamp F, Stripp ST, Happe T, Apfel UP, Winkler M, Haumann M. Differential Protonation at the Catalytic Six-Iron Cofactor of [FeFe]-Hydrogenases Revealed by 57Fe Nuclear Resonance X-ray Scattering and Quantum Mechanics/Molecular Mechanics Analyses. Inorg Chem 2019; 58:4000-4013. [PMID: 30802044 DOI: 10.1021/acs.inorgchem.9b00100] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[FeFe]-hydrogenases are efficient biological hydrogen conversion catalysts and blueprints for technological fuel production. The relations between substrate interactions and electron/proton transfer events at their unique six-iron cofactor (H-cluster) need to be elucidated. The H-cluster comprises a four-iron cluster, [4Fe4S], linked to a diiron complex, [FeFe]. We combined 57Fe-specific X-ray nuclear resonance scattering experiments (NFS, nuclear forward scattering; NRVS, nuclear resonance vibrational spectroscopy) with quantum-mechanics/molecular-mechanics computations to study the [FeFe]-hydrogenase HYDA1 from a green alga. Selective 57Fe labeling at only [4Fe4S] or [FeFe], or at both subcomplexes was achieved by protein expression with a 57Fe salt and in vitro maturation with a synthetic diiron site precursor containing 57Fe. H-cluster states were populated under infrared spectroscopy control. NRVS spectral analyses facilitated assignment of the vibrational modes of the cofactor species. This approach revealed the H-cluster structure of the oxidized state (Hox) with a bridging carbon monoxide at [FeFe] and ligand rearrangement in the CO-inhibited state (Hox-CO). Protonation at a cysteine ligand of [4Fe4S] in the oxidized state occurring at low pH (HoxH) was indicated, in contrast to bridging hydride binding at [FeFe] in a one-electron reduced state (Hred). These findings are direct evidence for differential protonation either at the four-iron or diiron subcomplex of the H-cluster. NFS time-traces provided Mössbauer parameters such as the quadrupole splitting energy, which differ among cofactor states, thereby supporting selective protonation at either subcomplex. In combination with data for reduced states showing similar [4Fe4S] protonation as HoxH without (Hred') or with (Hhyd) a terminal hydride at [FeFe], our results imply that coordination geometry dynamics at the diiron site and proton-coupled electron transfer to either the four-iron or the diiron subcomplex discriminate catalytic and regulatory functions of [FeFe]-hydrogenases. We support a reaction cycle avoiding diiron site geometry changes during rapid H2 turnover.
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Affiliation(s)
| | | | | | | | | | - Ulf-Peter Apfel
- Fraunhofer UMSICHT , Osterfelder Straße 3 , 46047 Oberhausen , Germany
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33
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Pogna EAA, Chumakov AI, Ferrante C, Ramos MA, Scopigno T. Tracking the Connection between Disorder and Energy Landscape in Glasses Using Geologically Hyperaged Amber. J Phys Chem Lett 2019; 10:427-432. [PMID: 30615469 DOI: 10.1021/acs.jpclett.9b00003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fossil amber offers the unique opportunity to investigate an amorphous material that has been exploring its energy landscape for more than 110 million years of natural aging. By applying different X-ray scattering methods to amber before and after annealing the sample to erase its thermal history, we identify a link between the potential energy landscape and the structural and vibrational properties of glasses. We find that hyperaging induces a depletion of the vibrational density of states in the terahertz region, also ruling the sound dispersion and attenuation properties of the corresponding acoustic waves. Critically, this is accompanied by a densification with structural implications different in nature from that caused by hydrostatic compression. Our results, rationalized within the framework of fluctuating elasticity theory, reveal how upon approaching the bottom of the potential energy landscape (9% decrease in the fictive temperature) the elastic matrix becomes increasingly less disordered (6%) and longer-range correlated (22%).
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Affiliation(s)
- E A A Pogna
- Laboratorio NEST , CNR-INFM and Scuola Normale Superiore , Piazza San Silvestro 12 , I-56127 Pisa , Italy
- Dipartimento di Fisica , Politecnico di Milano , Piazza Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - A I Chumakov
- ESRF-The European Synchrotron Radiation Facility CS40220 , F-38043 Grenoble Cedex, 9, France
- National Research Centre "Kurchatov Institute" , 123182 Moscow , Russia
| | - C Ferrante
- Dipartimento di Fisica , Universitá di Roma , La Sapienza , I-00185 Rome , Italy
- Center for Life Nano Science@Sapienza , Istituto Italiano di Tecnologia , Viale Regina, Elena 291 , 00161 Rome , Italy
| | - M A Ramos
- Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera , Universidad Autónoma de Madrid , E-28049 Madrid , Spain
| | - T Scopigno
- Dipartimento di Fisica , Universitá di Roma , La Sapienza , I-00185 Rome , Italy
- Center for Life Nano Science@Sapienza , Istituto Italiano di Tecnologia , Viale Regina, Elena 291 , 00161 Rome , Italy
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Polarization Analysis in Mössbauer Reflectometry with Synchrotron Mössbauer Source. CONDENSED MATTER 2019. [DOI: 10.3390/condmat4010008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Polarization selection of the reflected radiation has been employed in Mössbauer reflectivity measurements with a synchrotron Mössbauer source (SMS). The polarization of resonantly scattered radiation differs from the polarization of an incident wave so the Mössbauer reflectivity contains a scattering component with 90° rotated polarization relative to the π-polarization of the SMS for some hyperfine transitions. We have shown that the selection of this rotated π→σ component from total reflectivity gives an unusual angular dependence of reflectivity characterized by a peak near the critical angle of the total external reflection. In the case of collinear antiferromagnetic interlayer ordering, the “magnetic” maxima on the reflectivity angular curve are formed practically only by radiation with this rotated polarization. The first experiment on Mössbauer reflectivity with a selection of the rotated polarization discovers the predicted peak near the critical angle. The measurement of the rotated π→σ polarization component in Mössbauer reflectivity spectra excludes the interference with non-resonant electronic scattering and simplifies the spectrum shape near the critical angle allowing for an improved data interpretation in the case of poorly resolved spectra. It is shown that the selected component of Mössbauer reflectivity with rotated polarization is characterized by enhanced surface sensitivity, determined by the “squared standing waves” depth dependence. Therefore, the new approach has interesting perspectives for investigations of surfaces, ultrathin layers and multilayers having complicated magnetic structures.
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Stability and nature of the volume collapse of ε-Fe 2O 3 under extreme conditions. Nat Commun 2018; 9:4554. [PMID: 30385756 PMCID: PMC6212538 DOI: 10.1038/s41467-018-06966-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 09/27/2018] [Indexed: 11/09/2022] Open
Abstract
Iron oxides are among the major constituents of the deep Earth's interior. Among them, the epsilon phase of Fe2O3 is one of the less studied polymorphs and there is a lack of information about its structural, electronic and magnetic transformations at extreme conditions. Here we report the precise determination of its equation of state and a deep analysis of the evolution of the polyhedral units under compression, thanks to the agreement between our experiments and ab-initio simulations. Our results indicate that this material, with remarkable magnetic properties, is stable at pressures up to 27 GPa. Above 27 GPa, a volume collapse has been observed and ascribed to a change of the local environment of the tetrahedrally coordinated iron towards an octahedral coordination, finding evidence for a different iron oxide polymorph.
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Abstract
A Verwey-type charge-ordering transition in magnetite at 120 K leads to the formation of linear units of three iron ions with one shared electron, called trimerons. The recently-discovered iron pentoxide (Fe4O5) comprising mixed-valent iron cations at octahedral chains, demonstrates another unusual charge-ordering transition at 150 K involving competing formation of iron trimerons and dimerons. Here, we experimentally show that applied pressure can tune the charge-ordering pattern in Fe4O5 and strongly affect the ordering temperature. We report two charge-ordered phases, the first of which may comprise both dimeron and trimeron units, whereas, the second exhibits an overall dimerization involving both the octahedral and trigonal-prismatic chains of iron in the crystal structure. We link the dramatic change in the charge-ordering pattern in the second phase to redistribution of electrons between the octahedral and prismatic iron chains, and propose that the average oxidation state of the iron cations can pre-determine a charge-ordering pattern. The charge order transition of commonly known magnetite has only recently been unraveled. Here, the measurement of the low-temperature high-pressure phase diagram of a related material (Fe4O5) elucidates the interplay of average oxidation state and charge-ordering phenomena in the iron oxide family.
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Mikolasek M, Manrique-Juarez MD, Shepherd HJ, Ridier K, Rat S, Shalabaeva V, Bas AC, Collings IE, Mathieu F, Cacheux J, Leichle T, Nicu L, Nicolazzi W, Salmon L, Molnár G, Bousseksou A. Complete Set of Elastic Moduli of a Spin-Crossover Solid: Spin-State Dependence and Mechanical Actuation. J Am Chem Soc 2018; 140:8970-8979. [DOI: 10.1021/jacs.8b05347] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Mirko Mikolasek
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Maria D. Manrique-Juarez
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Helena J. Shepherd
- School of Physical Sciences, University of Kent, Canterbury, CT2 7NH, United Kingdom
| | - Karl Ridier
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Sylvain Rat
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | | | | | - Ines E. Collings
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Fabrice Mathieu
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Jean Cacheux
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Thierry Leichle
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Liviu Nicu
- LAAS-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | | | - Lionel Salmon
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Gábor Molnár
- LCC-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
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Andreeva MA, Baulin RA, Chumakov AI, Rüffer R, Smirnov GV, Babanov YA, Devyaterikov DI, Milyaev MA, Ponomarev DA, Romashev LN, Ustinov VV. Nuclear resonance reflectivity from a [ 57Fe/Cr] 30 multilayer with the Synchrotron Mössbauer Source. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:473-483. [PMID: 29488927 DOI: 10.1107/s1600577517017192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 11/29/2017] [Indexed: 06/08/2023]
Abstract
Mössbauer reflectivity spectra and nuclear resonance reflectivity (NRR) curves have been measured using the Synchrotron Mössbauer Source (SMS) for a [57Fe/Cr]30 periodic multilayer, characterized by the antiferromagnetic interlayer coupling between adjacent 57Fe layers. Specific features of the Mössbauer reflectivity spectra measured with π-polarized radiation of the SMS near the critical angle and at the `magnetic' maximum on the NRR curve are analyzed. The variation of the ratio of lines in the Mössbauer reflectivity spectra and the change of the intensity of the `magnetic' maximum under an applied external field has been used to reveal the transformation of the magnetic alignment in the investigated multilayer.
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Affiliation(s)
- Marina A Andreeva
- Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Roman A Baulin
- Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | | | - Rudolf Rüffer
- ESRF - The European Synchrotron, CS 40220, 38043 Grenoble Cedex 9, France
| | - Gennadii V Smirnov
- National Research Centre `Kurchatov Institute', Pl. Kurchatova 1, Moscow 123182, Russian Federation
| | - Yurii A Babanov
- M. N. Mikheev Institute of Metal Physics UB RAS, Ekaterinburg 620990, Russian Federation
| | - Denis I Devyaterikov
- M. N. Mikheev Institute of Metal Physics UB RAS, Ekaterinburg 620990, Russian Federation
| | - Mikhail A Milyaev
- M. N. Mikheev Institute of Metal Physics UB RAS, Ekaterinburg 620990, Russian Federation
| | - Dmitrii A Ponomarev
- M. N. Mikheev Institute of Metal Physics UB RAS, Ekaterinburg 620990, Russian Federation
| | - Lazar N Romashev
- M. N. Mikheev Institute of Metal Physics UB RAS, Ekaterinburg 620990, Russian Federation
| | - Vladimir V Ustinov
- M. N. Mikheev Institute of Metal Physics UB RAS, Ekaterinburg 620990, Russian Federation
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Mössbauer spectroscopy of a monolayer of single molecule magnets. Nat Commun 2018; 9:480. [PMID: 29396458 PMCID: PMC5797240 DOI: 10.1038/s41467-018-02840-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 01/03/2018] [Indexed: 11/30/2022] Open
Abstract
The use of single molecule magnets (SMMs) as cornerstone elements in spintronics and quantum computing applications demands that magnetic bistability is retained when molecules are interfaced with solid conducting surfaces. Here, we employ synchrotron Mössbauer spectroscopy to investigate a monolayer of a tetrairon(III) (Fe4) SMM chemically grafted on a gold substrate. At low temperature and zero magnetic field, we observe the magnetic pattern of the Fe4 molecule, indicating slow spin fluctuations compared to the Mössbauer timescale. Significant structural deformations of the magnetic core, induced by the interaction with the substrate, as predicted by ab initio molecular dynamics, are also observed. However, the effects of the modifications occurring at the individual iron sites partially compensate each other, so that slow magnetic relaxation is retained on the surface. Interestingly, these deformations escaped detection by conventional synchrotron-based techniques, like X-ray magnetic circular dichroism, thus highlighting the power of synchrotron Mössbauer spectroscopy for the investigation of hybrid interfaces. Deposition of single molecule magnets onto surfaces is a key step for integration in devices exploiting their magnetic bistability and quantum properties. Here, Sessoli and colleagues exploit synchrotron Mössbauer spectroscopy to assess the effects of molecule-surface interactions on the magnetic properties of Fe(III) SMMs.
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40
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Miłaczewska A, Kot E, Amaya JA, Makris TM, Zając M, Korecki J, Chumakov A, Trzewik B, Kędracka-Krok S, Minor W, Chruszcz M, Borowski T. On the Structure and Reaction Mechanism of Human Acireductone Dioxygenase. Chemistry 2018; 24:5225-5237. [PMID: 29193386 DOI: 10.1002/chem.201704617] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Indexed: 12/24/2022]
Abstract
Acireductone dioxygenase (ARD) is an intriguing enzyme from the methionine salvage pathway that is capable of catalysing two different oxidation reactions with the same substrate depending on the type of the metal ion in the active site. To date, the structural information regarding the ARD-acireductone complex is limited and possible reaction mechanisms are still under debate. The results of joint experimental and computational studies undertaken to advance knowledge about ARD are reported. The crystal structure of an ARD from Homo sapiens was determined with selenomethionine. EPR spectroscopy suggested that binding acireductone triggers one protein residue to dissociate from Fe2+ , which allows NO (and presumably O2 ) to bind directly to the metal. Mössbauer spectroscopic data (interpreted with the aid of DFT calculations) was consistent with bidentate binding of acireductone to Fe2+ and concomitant dissociation of His88 from the metal. Major features of Fe vibrational spectra obtained for the native enzyme and upon addition of acireductone were reproduced by QM/MM calculations for the proposed models. A computational (QM/MM) study of the reaction mechanisms suggests that Fe2+ promotes O-O bond homolysis, which elicits cleavage of the C1-C2 bond of the substrate. Higher M3+ /M2+ redox potentials of other divalent metals do not support this pathway, and instead the reaction proceeds similarly to the key reaction step in the quercetin 2,3-dioxygenase mechanism.
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Affiliation(s)
- Anna Miłaczewska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland.,University of Virginia, Department of Molecular Physiology and Biological Physics, 1340 Jefferson Park Avenue, Charlottesville, VA, 22908, USA
| | - Ewa Kot
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland
| | - José A Amaya
- University of South Carolina, Department of Chemistry and Biochemistry, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Thomas M Makris
- University of South Carolina, Department of Chemistry and Biochemistry, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Marcin Zając
- National Synchrotron Radiation Centre Solaris, Jagiellonian University, ul. Czerwone Maki 98, 30-392, Kraków, Poland
| | - Józef Korecki
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland.,AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059, Kraków, Poland
| | - Aleksandr Chumakov
- European Synchrotron Radiation Facility (ESRF), P.O. Box 220, F-, 38043, Grenoble, France
| | - Bartosz Trzewik
- Jagiellonian University, Faculty of Chemistry, ul. Romana Ingardena 3, 30-060, Kraków, Poland
| | - Sylwia Kędracka-Krok
- Department of Physical Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland.,Malopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7a, 30-387, Krakow, Poland
| | - Władek Minor
- University of Virginia, Department of Molecular Physiology and Biological Physics, 1340 Jefferson Park Avenue, Charlottesville, VA, 22908, USA
| | - Maksymilian Chruszcz
- University of South Carolina, Department of Chemistry and Biochemistry, 631 Sumter Street, Columbia, SC, 29208, USA
| | - Tomasz Borowski
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland
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41
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Caporaletti F, Chumakov AI, Rüffer R, Monaco G. A new experimental scheme for nuclear γ-resonance time-domain interferometry. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:105114. [PMID: 29092529 DOI: 10.1063/1.5008868] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Time-domain interferometry (TDI) based on nuclear resonant scattering of synchrotron radiation by Mössbauer nuclei is a promising technique to study slow dynamics at the interatomic length scale. In order to improve the efficiency of this technique, a new TDI scheme is developed involving the use of a nuclear absorber with a two-line energy spectrum combined with a single-line spectrum. Different from other TDI setups, the issue of external vibrations is much reduced since the two absorbers are at rest and no velocity transducer is used. This allows measuring beating patterns with satisfying statistical accuracy and contrast up to 350 ns. We report here the characterization of the experimental setup necessary for the implementation of this new scheme. The model required for the description of the beating pattern produced by a three-line spectrum system is also discussed in detail. Finally, we report some results for the dynamics of the prototypical glass-former ortho-terphenyl to demonstrate the possibilities offered by this new scheme.
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Affiliation(s)
- F Caporaletti
- Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy
| | - A I Chumakov
- ESRF-The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - R Rüffer
- ESRF-The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - G Monaco
- Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy
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42
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Félix G, Mikolasek M, Shepherd HJ, Long J, Larionova J, Guari Y, Itié JP, Chumakov AI, Nicolazzi W, Molnár G, Bousseksou A. Elasticity of Prussian-Blue-Analogue Nanoparticles. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700796] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Gautier Félix
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Mirko Mikolasek
- CS40220; ESRF - The European Synchrotron; 38043 Grenoble Cedex 9 France
| | - Helena J. Shepherd
- School of Physical Sciences; University of Kent; Park Wood Rd CT2 7NH Canterbury United Kingdom
| | - Jérôme Long
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Joulia Larionova
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Yannick Guari
- Institut Charles Gerhardt Montpellier; UMR 5253, Ingénierie Moléculaire et Nano-Objets; Université de Montpellier, ENSCM, CNRS; Place E. Bataillon 34095 Montpellier Cedex 5 France
| | - Jean-Paul Itié
- Synchrotron SOLEIL; L'Orme des Merisiers; Saint-Aubin 91192 Gif-sur-Yvette France
| | | | - William Nicolazzi
- Laboratoire de Chimie de Coordination; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
| | - Gábor Molnár
- Laboratoire de Chimie de Coordination; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
| | - Azzedine Bousseksou
- Laboratoire de Chimie de Coordination; CNRS & Université de Toulouse (UPS, INP); 205 route de Narbonne 31077 Toulouse France
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43
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Heeg KP, Kaldun A, Strohm C, Reiser P, Ott C, Subramanian R, Lentrodt D, Haber J, Wille HC, Goerttler S, Rüffer R, Keitel CH, Röhlsberger R, Pfeifer T, Evers J. Spectral narrowing of x-ray pulses for precision spectroscopy with nuclear resonances. Science 2017; 357:375-378. [PMID: 28751603 DOI: 10.1126/science.aan3512] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/26/2017] [Indexed: 11/02/2022]
Affiliation(s)
- K. P. Heeg
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - A. Kaldun
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - C. Strohm
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - P. Reiser
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - C. Ott
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - R. Subramanian
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D. Lentrodt
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - J. Haber
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - H.-C. Wille
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - S. Goerttler
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - R. Rüffer
- ESRF–European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - C. H. Keitel
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - R. Röhlsberger
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - T. Pfeifer
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - J. Evers
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
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44
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Stability of iron-bearing carbonates in the deep Earth's interior. Nat Commun 2017; 8:15960. [PMID: 28722013 PMCID: PMC5524932 DOI: 10.1038/ncomms15960] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 05/16/2017] [Indexed: 11/08/2022] Open
Abstract
The presence of carbonates in inclusions in diamonds coming from depths exceeding 670 km are obvious evidence that carbonates exist in the Earth's lower mantle. However, their range of stability, crystal structures and the thermodynamic conditions of the decarbonation processes remain poorly constrained. Here we investigate the behaviour of pure iron carbonate at pressures over 100 GPa and temperatures over 2,500 K using single-crystal X-ray diffraction and Mössbauer spectroscopy in laser-heated diamond anvil cells. On heating to temperatures of the Earth's geotherm at pressures to ∼50 GPa FeCO3 partially dissociates to form various iron oxides. At higher pressures FeCO3 forms two new structures-tetrairon(III) orthocarbonate Fe43+C3O12, and diiron(II) diiron(III) tetracarbonate Fe22+Fe23+C4O13, both phases containing CO4 tetrahedra. Fe4C4O13 is stable at conditions along the entire geotherm to depths of at least 2,500 km, thus demonstrating that self-oxidation-reduction reactions can preserve carbonates in the Earth's lower mantle.
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45
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Masuda T, Okubo S, Hara H, Hiraki T, Kitao S, Miyamoto Y, Okai K, Ozaki R, Sasao N, Seto M, Uetake S, Yamaguchi A, Yoda Y, Yoshimi A, Yoshimura K. Fast x-ray detector system with simultaneous measurement of timing and energy for a single photon. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:063105. [PMID: 28667968 DOI: 10.1063/1.4989405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We developed a fast X-ray detector system for nuclear resonant scattering (NRS) experiments. Our system employs silicon avalanche photo-diode (Si-APD) as a fast X-ray sensor. The system is able to acquire both timing and energy of a single X-ray photon simultaneously in a high rate condition, 106 counts per second for one Si-APD. The performance of the system was investigated in SPring-8, a synchrotron radiation facility in Japan. Good time resolution of 120 ps (FWHM) was achieved with a slight tail distribution in the time spectrum by a level of 10-9 at 1 ns apart from the peak. Using this system, we successfully observed the NRS from the 26.27-keV level of mercury-201, which has a half-life of 630(50) ps. We also demonstrated the reduction of background events caused by radioactive decays in a radioactive sample by discriminating photon energy.
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Affiliation(s)
- T Masuda
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - S Okubo
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - H Hara
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - T Hiraki
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - S Kitao
- Research Reactor Institute, Kyoto University, Osaka 590-0494, Japan
| | - Y Miyamoto
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - K Okai
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - R Ozaki
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
| | - N Sasao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - M Seto
- Research Reactor Institute, Kyoto University, Osaka 590-0494, Japan
| | - S Uetake
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - A Yamaguchi
- Quantum Metrology Laboratory, RIKEN, Saitama 351-0198, Japan
| | - Y Yoda
- Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan
| | - A Yoshimi
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - K Yoshimura
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
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46
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Blukis R, Rüffer R, Chumakov AI, Harrison RJ. A high spatial resolution synchrotron Mössbauer study of the Tazewell IIICD and Esquel pallasite meteorites. METEORITICS & PLANETARY SCIENCE 2017; 52:925-936. [PMID: 28713215 PMCID: PMC5488627 DOI: 10.1111/maps.12841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 12/05/2016] [Indexed: 05/22/2023]
Abstract
Metallic phases in the Tazewell IIICD iron and Esquel pallasite meteorites were examined using 57Fe synchrotron Mössbauer spectroscopy. Spatial resolution of ~10-20 μm was achieved, together with high throughput, enabling individual spectra to be recorded in less than 1 h. Spectra were recorded every 5-10 μm, allowing phase fractions and hyperfine parameters to be traced along transects of key microstructural features. The main focus of the study was the transitional region between kamacite and plessite, known as the "cloudy zone." Results confirm the presence of tetrataenite and antitaenite in the cloudy zone as its only components. However, both phases were also found in plessite, indicating that antitaenite is not restricted exclusively to the cloudy zone, as previously thought. The confirmation of paramagnetic antitaenite as the matrix phase of the cloudy zone contrasts with recent observations of a ferromagnetic matrix phase using X-ray photoemission electron spectroscopy. Possible explanations for the different results seen using these techniques are proposed.
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Affiliation(s)
- Roberts Blukis
- Department of Earth SciencesUniversity of CambridgeCambridgeCB2 3EQUK
| | - Rudolf Rüffer
- European Synchrotron Radiation FacilityCS 40220F‐38043GrenobleFrance
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47
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Friedman Y, Nowik I, Felner I, Steiner JM, Yudkin E, Livshitz S, Wille HC, Wortmann G, Chumakov AI. Advances in testing the effect of acceleration on time dilation using a synchrotron Mössbauer source. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:661-666. [PMID: 28452758 DOI: 10.1107/s1600577517002405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 02/12/2017] [Indexed: 06/07/2023]
Abstract
New results, additional techniques and know-how acquired, developed and employed in a recent HC-1898 experiment at the Nuclear Resonance Beamline ID18 of ESRF are presented, in the quest to explore the acceleration effect on time dilation. Using the specially modified Synchrotron Mössbauer Source and KB-optics together with a rotating single-line semicircular Mössbauer absorber on the rim of a specially designed rotating disk, the aim was to measure the relative spectral shift between the spectra of two states when the acceleration of the absorber is anti-parallel and parallel to the source. A control system was used for the first time and a method to quantify the effects of non-random vibrations on the spectral shift was developed. For several runs where the effect of these vibrations was negligible, a stable statistically significant non-zero relative shift was observed. This suggests the influence of acceleration on time.
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Affiliation(s)
- Y Friedman
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - I Nowik
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - I Felner
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
| | - J M Steiner
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - E Yudkin
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - S Livshitz
- Jerusalem College of Technology, POB 16031, Jerusalem 91160, Israel
| | - H C Wille
- Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22607 Hamburg, Germany
| | - G Wortmann
- Department Physik, Universität Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany
| | - A I Chumakov
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
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48
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Agbelele A, Sando D, Toulouse C, Paillard C, Johnson RD, Rüffer R, Popkov AF, Carrétéro C, Rovillain P, Le Breton JM, Dkhil B, Cazayous M, Gallais Y, Méasson MA, Sacuto A, Manuel P, Zvezdin AK, Barthélémy A, Juraszek J, Bibes M. Strain and Magnetic Field Induced Spin-Structure Transitions in Multiferroic BiFeO 3. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1602327. [PMID: 28036128 DOI: 10.1002/adma.201602327] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 09/23/2016] [Indexed: 06/06/2023]
Abstract
The magnetic-field-dependent spin ordering of strained BiFeO3 films is determined using nuclear resonant scattering and Raman spectroscopy. The critical field required to destroy the cycloidal modulation of the Fe spins is found to be significantly lower than in the bulk, with appealing implications for field-controlled spintronic and magnonic devices.
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Affiliation(s)
- A Agbelele
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, GPM, 76800, Rouen, France
| | - D Sando
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France
- School of Materials Science and Engineering, UNSW Australia, Sydney, NSW, 2052, Australia
| | - C Toulouse
- Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205, Paris Cedex 13, France
| | - C Paillard
- Laboratoire Structure, Propriétés et Modélisation des Solides, CentraleSupelec, CNRS-UMR8580, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - R D Johnson
- Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
| | - R Rüffer
- European Synchrotron Radiation Facility, CS 40220, F-38043, Grenoble Cedex 9, France
| | - A F Popkov
- Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudny, Russia
- National Research University of Electronic Technology (MIET), Pas. 4806, Bld. 5, Zelenograd, 124498, Moscow, Russia
| | - C Carrétéro
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France
| | - P Rovillain
- Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205, Paris Cedex 13, France
| | - J-M Le Breton
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, GPM, 76800, Rouen, France
| | - B Dkhil
- Laboratoire Structure, Propriétés et Modélisation des Solides, CentraleSupelec, CNRS-UMR8580, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - M Cazayous
- Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205, Paris Cedex 13, France
| | - Y Gallais
- Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205, Paris Cedex 13, France
| | - M-A Méasson
- Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205, Paris Cedex 13, France
| | - A Sacuto
- Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205, Paris Cedex 13, France
| | - P Manuel
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - A K Zvezdin
- Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudny, Russia
- Prokhorov General Physics Institute, Russian Academy of Sciences, 119991, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow, 143025, Russia
| | - A Barthélémy
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France
| | - J Juraszek
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, GPM, 76800, Rouen, France
| | - M Bibes
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767, Palaiseau, France
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49
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Seiler A, Piekarz P, Ibrahimkutty S, Merkel DG, Waller O, Pradip R, Chumakov AI, Rüffer R, Baumbach T, Parlinski K, Fiederle M, Stankov S. Anomalous Lattice Dynamics of EuSi_{2} Nanoislands: Role of Interfaces Unveiled. PHYSICAL REVIEW LETTERS 2016; 117:276101. [PMID: 28084777 DOI: 10.1103/physrevlett.117.276101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Indexed: 06/06/2023]
Abstract
We report a systematic lattice dynamics study of EuSi_{2} films and nanoislands by in situ nuclear inelastic scattering on ^{151}Eu and ab initio theory. The Eu-partial phonon density of states of the nanoislands exhibits anomalous excess of phonon states at low and high energies, not present in the bulk and at the EuSi_{2}(001) surface. We demonstrate that atomic vibrations along the island-substrate interface give rise to phonon states both at low and high energies, while atomic vibrations across the island-island interface result in localized high-energy phonon modes.
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Affiliation(s)
- A Seiler
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
| | - P Piekarz
- Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland
| | - S Ibrahimkutty
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
| | - D G Merkel
- ESRF-The European Synchrotron, F-38000 Grenoble, France
| | - O Waller
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
| | - R Pradip
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
| | - A I Chumakov
- ESRF-The European Synchrotron, F-38000 Grenoble, France
| | - R Rüffer
- ESRF-The European Synchrotron, F-38000 Grenoble, France
| | - T Baumbach
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
- ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
| | - K Parlinski
- Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Kraków, Poland
| | - M Fiederle
- Freiburg Materials Research Center, University of Freiburg, D-79104 Freiburg, Germany
| | - S Stankov
- Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany
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50
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Raman and nuclear inelastic scattering study of the lattice dynamics of the [Fe(H 2 B(pz) 2 ) 2 (phen)] spin crossover complex. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.04.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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