1
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Bluschke M, Gupta NK, Jang H, Husain AA, Lee B, Kim M, Na M, Dos Remedios B, Smit S, Moen P, Park SY, Kim M, Jang D, Choi H, Sutarto R, Reid AH, Dakovski GL, Coslovich G, Nguyen QL, Burdet NG, Lin MF, Revcolevschi A, Park JH, Geck J, Turner JJ, Damascelli A, Hawthorn DG. Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La 1.65Eu 0.2Sr 0.15CuO 4. Proc Natl Acad Sci U S A 2024; 121:e2400727121. [PMID: 38819998 PMCID: PMC11161785 DOI: 10.1073/pnas.2400727121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 04/25/2024] [Indexed: 06/02/2024] Open
Abstract
Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant X-ray scattering on the (0 0 1) Bragg peak at the Cu [Formula: see text] and O [Formula: see text] resonances, we investigate nonequilibrium dynamics of [Formula: see text] nematic order and its association with both charge density wave (CDW) order and lattice dynamics in La[Formula: see text]Eu[Formula: see text]Sr[Formula: see text]CuO[Formula: see text]. The orbital selectivity of the resonant X-ray scattering cross-section allows nematicity dynamics associated with the planar O 2[Formula: see text] and Cu 3[Formula: see text] states to be distinguished from the response of anisotropic lattice distortions. A direct time-domain comparison of CDW translational-symmetry breaking and nematic rotational-symmetry breaking reveals that these broken symmetries remain closely linked in the photoexcited state, consistent with the stability of CDW topological defects in the investigated pump fluence regime.
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Affiliation(s)
- Martin Bluschke
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - Naman K. Gupta
- Department of Physics and Astronomy, University of Waterloo, Waterloo, ONN2L 3G1, Canada
| | - Hoyoung Jang
- X-ray Free Electron Laser Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang37673, Gyeongbuk, Republic of Korea
- Photon Science Center, Pohang University of Science and Technology, Pohang37673, Gyeongbuk, Republic of Korea
| | - Ali. A. Husain
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - Byungjune Lee
- Max Planck - Pohang University of Science and Technology/Korea Research Initiative, Center for Complex Phase Materials, Pohang37673, Republic of Korea
- Department of Physics, Pohang University of Science and Technology, Pohang37673, Republic of Korea
| | - Minjune Kim
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - MengXing Na
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - Brandon Dos Remedios
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - Steef Smit
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - Peter Moen
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - Sang-Youn Park
- X-ray Free Electron Laser Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang37673, Gyeongbuk, Republic of Korea
| | - Minseok Kim
- X-ray Free Electron Laser Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang37673, Gyeongbuk, Republic of Korea
| | - Dogeun Jang
- X-ray Free Electron Laser Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang37673, Gyeongbuk, Republic of Korea
| | - Hyeongi Choi
- X-ray Free Electron Laser Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang37673, Gyeongbuk, Republic of Korea
| | | | - Alexander H. Reid
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
| | - Georgi L. Dakovski
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
| | - Giacomo Coslovich
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
| | - Quynh L. Nguyen
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
- Stanford PULSE Institute, Stanford University and Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
| | - Nicolas G. Burdet
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
- Stanford Institute for Materials and Energy Sciences, Stanford Linear Accelerator Center National Accelerator Laboratory and Stanford University, Menlo Park, CA94025
| | - Ming-Fu Lin
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
| | - Alexandre Revcolevschi
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris-Saclay, Centre National de la Recherche Scientifique, UMR 8182, 91405Orsay, France
| | - Jae-Hoon Park
- Max Planck - Pohang University of Science and Technology/Korea Research Initiative, Center for Complex Phase Materials, Pohang37673, Republic of Korea
- Department of Physics, Pohang University of Science and Technology, Pohang37673, Republic of Korea
| | - Jochen Geck
- Institute of Solid State and Materials Physics, Technische Universität Dresden, 01069Dresden, Germany
- Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062Dresden, Germany
| | - Joshua J. Turner
- Linac Coherent Light Source, Stanford Linear Accelerator Center National Accelerator Laboratory, Menlo Park, CA94025
- Stanford Institute for Materials and Energy Sciences, Stanford Linear Accelerator Center National Accelerator Laboratory and Stanford University, Menlo Park, CA94025
| | - Andrea Damascelli
- Quantum Matter Institute, University of British Columbia, Vancouver, BCV6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BCV6T 1Z1, Canada
| | - David G. Hawthorn
- Department of Physics and Astronomy, University of Waterloo, Waterloo, ONN2L 3G1, Canada
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2
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Carbin T, Zhang X, Culver AB, Zhao H, Zong A, Acharya R, Abbamonte CJ, Roy R, Cao G, Kogar A. Evidence for Bootstrap Percolation Dynamics in a Photoinduced Phase Transition. PHYSICAL REVIEW LETTERS 2023; 130:186902. [PMID: 37204876 DOI: 10.1103/physrevlett.130.186902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 01/27/2023] [Accepted: 03/30/2023] [Indexed: 05/21/2023]
Abstract
Upon intense femtosecond photoexcitation, a many-body system can undergo a phase transition through a nonequilibrium route, but understanding these pathways remains an outstanding challenge. Here, we use time-resolved second harmonic generation to investigate a photoinduced phase transition in Ca_{3}Ru_{2}O_{7} and show that mesoscale inhomogeneity profoundly influences the transition dynamics. We observe a marked slowing down of the characteristic time τ that quantifies the transition between two structures. τ evolves nonmonotonically as a function of photoexcitation fluence, rising from below 200 fs to ∼1.4 ps, then falling again to below 200 fs. To account for the observed behavior, we perform a bootstrap percolation simulation that demonstrates how local structural interactions govern the transition kinetics. Our work highlights the importance of percolating mesoscale inhomogeneity in the dynamics of photoinduced phase transitions and provides a model that may be useful for understanding such transitions more broadly.
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Affiliation(s)
- Tyler Carbin
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
| | - Xinshu Zhang
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
| | - Adrian B Culver
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
- Mani L. Bhaumik Institute for Theoretical Physics, Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA
| | - Hengdi Zhao
- Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA
| | - Alfred Zong
- Department of Chemistry, University of California at Berkeley, Berkeley, California, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA
| | - Rishi Acharya
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
| | - Cecilia J Abbamonte
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
| | - Rahul Roy
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
- Mani L. Bhaumik Institute for Theoretical Physics, Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA
| | - Gang Cao
- Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA
| | - Anshul Kogar
- Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA
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3
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Wandel S, Boschini F, da Silva Neto EH, Shen L, Na MX, Zohar S, Wang Y, Welch SB, Seaberg MH, Koralek JD, Dakovski GL, Hettel W, Lin MF, Moeller SP, Schlotter WF, Reid AH, Minitti MP, Boyle T, He F, Sutarto R, Liang R, Bonn D, Hardy W, Kaindl RA, Hawthorn DG, Lee JS, Kemper AF, Damascelli A, Giannetti C, Turner JJ, Coslovich G. Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor. Science 2022; 376:860-864. [PMID: 35587968 DOI: 10.1126/science.abd7213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Superconductivity and charge density waves (CDWs) are competitive, yet coexisting, orders in cuprate superconductors. To understand their microscopic interdependence, a probe capable of discerning their interaction on its natural length and time scale is necessary. We use ultrafast resonant soft x-ray scattering to track the transient evolution of CDW correlations in YBa2Cu3O6+x after the quench of superconductivity by an infrared laser pulse. We observe a nonthermal response of the CDW order characterized by a near doubling of the correlation length within ≈1 picosecond of the superconducting quench. Our results are consistent with a model in which the interaction between superconductivity and CDWs manifests inhomogeneously through disruption of spatial coherence, with superconductivity playing the dominant role in stabilizing CDW topological defects, such as discommensurations.
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Affiliation(s)
- S Wandel
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - F Boschini
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.,Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.,Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, QC J3X 1S2, Canada
| | - E H da Silva Neto
- Department of Physics, Yale University, New Haven, CT 06520, USA.,Energy Sciences Institute, Yale University, New Haven, CT 06516, USA.,Department of Physics, University of California, Davis, CA 95616, USA
| | - L Shen
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA
| | - M X Na
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.,Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - S Zohar
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Y Wang
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - S B Welch
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - M H Seaberg
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - J D Koralek
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - W Hettel
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - M-F Lin
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - S P Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - A H Reid
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - M P Minitti
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - T Boyle
- Department of Physics, Yale University, New Haven, CT 06520, USA.,Energy Sciences Institute, Yale University, New Haven, CT 06516, USA.,Department of Physics, University of California, Davis, CA 95616, USA
| | - F He
- Canadian Light Source, Saskatoon, SK S7N 2V3, Canada
| | - R Sutarto
- Canadian Light Source, Saskatoon, SK S7N 2V3, Canada
| | - R Liang
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.,Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - D Bonn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.,Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - W Hardy
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.,Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - R A Kaindl
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - D G Hawthorn
- Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - J-S Lee
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - A F Kemper
- Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
| | - A Damascelli
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.,Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - C Giannetti
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia, BS I-25121, Italy
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA
| | - G Coslovich
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
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4
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Gonzalez-Vallejo I, Jacques VLR, Boschetto D, Rizza G, Hadj-Azzem A, Faure J, Le Bolloc'h D. Time-resolved structural dynamics of the out-of-equilibrium charge density wave phase transition in GdTe 3. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2022; 9:014502. [PMID: 38143930 PMCID: PMC10748500 DOI: 10.1063/4.0000131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 02/07/2022] [Indexed: 12/26/2023]
Abstract
We use ultrafast electron diffraction to study the out-of-equilibrium dynamics of the charge density wave (CDW) phase transition in GdTe3, a quasi-two-dimensional compound displaying a unidirectional CDW state. Experiments were conducted at different incident fluences and different initial sample temperatures below Tc. We find that following photo-excitation, the system undergoes a non-thermal ultrafast phase transition that occurs in out-of-equilibrium conditions. The intrinsic crystal temperature was estimated at each time delay from the atomic thermal motion, which affects each Bragg peak intensity via the Debye Waller factor. We find that the crystal temperature stabilizes with a 6 ps timescale in a quasi-equilibrium state at temperature T q . e . . We then relate the recovery time of the CDW and its correlation lengths as a function of T q . e . . The charge density wave is suppressed in less than a picosecond while its recovery time increases linearly with incident fluence and initial temperature. Our results highlight that the dynamics is strongly determined by the initial sample temperature. In addition, the transient CDW phase recently observed along the transverse direction in LaTe3 and CeTe3 is not observed in GdTe3.
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Affiliation(s)
| | | | - D. Boschetto
- LOA, CNRS, Ecole Polytechnique, ENSTA Paris, Institut Polytechnique de Paris, Palaiseau, France
| | - G. Rizza
- LSI, Institut Polytechnique de Paris, CEA/DRF/IRAMIS, CNRS, Ecole polytechnique, Route de Saclay, Palaiseau, France
| | | | - J. Faure
- LOA, CNRS, Ecole Polytechnique, ENSTA Paris, Institut Polytechnique de Paris, Palaiseau, France
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5
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Soft X-ray Lensless Imaging in Reflection Mode. PHOTONICS 2021. [DOI: 10.3390/photonics8120569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We report on the development and implementation of methodologies dedicated to soft X-ray imaging by coherent scattering in reflection mode. Two complementary approaches are tested, based on Fourier transform holography and on ptychography. A new method for designing holographic masks has been developed. Our results represent a feasibility test and highlight the potential and limitations of imaging in reflection mode. Reflectivity is less efficient than transmission at soft X-ray wavelengths, hampering the acquisition of good quality images. Nonetheless, it has the potential to image a wider set of samples, notably those that are not transparent to soft X-rays. Although the images obtained so far are of modest quality, these results are extremely encouraging for continuing the development of coherent soft X-ray imaging in reflection mode.
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6
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Ricci A, Poccia N, Campi G, Mishra S, Müller L, Joseph B, Shi B, Zozulya A, Buchholz M, Trabant C, Lee JCT, Viefhaus J, Goedkoop JB, Nugroho AA, Braden M, Roy S, Sprung M, Schüßler-Langeheine C. Measurement of Spin Dynamics in a Layered Nickelate Using X-Ray Photon Correlation Spectroscopy: Evidence for Intrinsic Destabilization of Incommensurate Stripes at Low Temperatures. PHYSICAL REVIEW LETTERS 2021; 127:057001. [PMID: 34397237 DOI: 10.1103/physrevlett.127.057001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 05/10/2021] [Indexed: 06/13/2023]
Abstract
We study the temporal stability of stripe-type spin order in a layered nickelate with x-ray photon correlation spectroscopy and observe fluctuations on timescales of tens of minutes over a wide temperature range. These fluctuations show an anomalous temperature dependence: they slow down at intermediate temperatures and speed up on both heating and cooling. This behavior appears to be directly connected with spatial correlations: stripes fluctuate slowly when stripe correlation lengths are large and become faster when spatial correlations decrease. A low-temperature decay of nickelate stripe correlations, reminiscent of what occurs in cuprates as a result of a competition between stripes and superconductivity, hence occurs via loss of both spatial and temporal correlations.
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Affiliation(s)
- Alessandro Ricci
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Nicola Poccia
- Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany
| | - Gaetano Campi
- Institute of Crystallography, CNR, Via Salaria km. 29,3 - 00015 Monterotondo, Roma, Italy
| | - Shrawan Mishra
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- School of Materials Science and Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India
| | - Leonard Müller
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Boby Joseph
- Elettra Sincrotrone Trieste, Strada Statale 14 - km 163,5, AREA Science Park, I-34149 Basovizza, Trieste, Italy
| | - Bo Shi
- Van der Waals-Zeeman Institute, University of Amsterdam, 1098 XH Amsterdam, Netherlands
| | - Alexey Zozulya
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Marcel Buchholz
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
| | - Christoph Trabant
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - James C T Lee
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Physics and Astronomy, Sonoma State University, 1801 East Cotati Avenue, Rohnert Park, California 94928-3609, USA
- Department of Physics, Concordia College, 901 8th Street South, Moorhead, Minnesota 56562 USA
| | - Jens Viefhaus
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Jeroen B Goedkoop
- Van der Waals-Zeeman Institute, University of Amsterdam, 1098 XH Amsterdam, Netherlands
| | - Agustinus Agung Nugroho
- Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung, Jalan Ganesha 10 Bandung, 40132, Indonesia
| | - Markus Braden
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
| | - Sujoy Roy
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Michael Sprung
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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7
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Bretscher HM, Andrich P, Telang P, Singh A, Harnagea L, Sood AK, Rao A. Ultrafast melting and recovery of collective order in the excitonic insulator Ta 2NiSe 5. Nat Commun 2021; 12:1699. [PMID: 33727541 PMCID: PMC7966769 DOI: 10.1038/s41467-021-21929-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 02/08/2021] [Indexed: 01/05/2023] Open
Abstract
The layered chalcogenide Ta2NiSe5 has been proposed to host an excitonic condensate in its ground state, a phase that could offer a unique platform to study and manipulate many-body states at room temperature. However, identifying the dominant microscopic contribution to the observed spontaneous symmetry breaking remains challenging, perpetuating the debate over the ground state properties. Here, using broadband ultrafast spectroscopy we investigate the out-of-equilibrium dynamics of Ta2NiSe5 and demonstrate that the transient reflectivity in the near-infrared range is connected to the system's low-energy physics. We track the status of the ordered phase using this optical signature, establishing that high-fluence photoexcitations can suppress this order. From the sub-50 fs quenching timescale and the behaviour of the photoinduced coherent phonon modes, we conclude that electronic correlations provide a decisive contribution to the excitonic order formation. Our results pave the way towards the ultrafast control of an exciton condensate at room temperature.
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Affiliation(s)
| | - Paolo Andrich
- Cavendish Laboratory, University of Cambridge, Cambridge, UK.
| | - Prachi Telang
- Department of Physics, Indian Institute of Science Education and Research, Pune, Maharashtra, India
| | - Anupam Singh
- Department of Physics, Indian Institute of Science Education and Research, Pune, Maharashtra, India
| | - Luminita Harnagea
- Department of Physics, Indian Institute of Science Education and Research, Pune, Maharashtra, India
| | - A K Sood
- Department of Physics, Indian Institute of Science, Bangalore, Karnataka, India
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, Cambridge, UK.
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8
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Lu H, Gauthier A, Hepting M, Tremsin AS, Reid AH, Kirchmann PS, Shen ZX, Devereaux TP, Shao YC, Feng X, Coslovich G, Hussain Z, Dakovski GL, Chuang YD, Lee WS. Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser. Sci Rep 2020; 10:22226. [PMID: 33335197 PMCID: PMC7746750 DOI: 10.1038/s41598-020-79210-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 11/30/2020] [Indexed: 11/21/2022] Open
Abstract
Time-resolved resonant inelastic X-ray scattering (RIXS) is one of the developing techniques enabled by the advent of X-ray free electron laser (FEL). It is important to evaluate how the FEL jitter, which is inherent in the self-amplified spontaneous emission process, influences the RIXS measurement. Here, we use a microchannel plate (MCP) based Timepix soft X-ray detector to conduct a time-resolved RIXS measurement at the Ti L3-edge on a charge-density-wave material TiSe2. The fast parallel Timepix readout and single photon sensitivity enable pulse-by-pulse data acquisition and analysis. Due to the FEL jitter, low detection efficiency of spectrometer, and low quantum yield of RIXS process, we find that less than 2% of the X-ray FEL pulses produce signals, preventing acquiring sufficient data statistics while maintaining temporal and energy resolution in this measurement. These limitations can be mitigated by using future X-ray FELs with high repetition rates, approaching MHz such as the European XFEL in Germany and LCLS-II in the USA, as well as by utilizing advanced detectors, such as the prototype used in this study.
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Affiliation(s)
- H Lu
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - A Gauthier
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - M Hepting
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - A S Tremsin
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - A H Reid
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - P S Kirchmann
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - Z X Shen
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - T P Devereaux
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA, 94305, USA.,Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Y C Shao
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - X Feng
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - G Coslovich
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Z Hussain
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - G L Dakovski
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Y D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - W S Lee
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
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9
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Abreu E, Meyers D, Thorsmølle VK, Zhang J, Liu X, Geng K, Chakhalian J, Averitt RD. Nucleation and Growth Bottleneck in the Conductivity Recovery Dynamics of Nickelate Ultrathin Films. NANO LETTERS 2020; 20:7422-7428. [PMID: 32902285 DOI: 10.1021/acs.nanolett.0c02828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate THz conductivity dynamics in NdNiO3 and EuNiO3 ultrathin films (15 unit cells, u.c., ∼5.7 nm thick) following a photoinduced thermal quench into the metallic state and reveal a clear contrast between first- and second-order dynamics. While in EuNiO3 the conductivity recovers exponentially, in NdNiO3 the recovery is nonexponential and slower than a simple thermal model. Crucially, it is consistent with first-order dynamics and well-described by a 2d Avrami model, with supercooling leading to metastable phase coexistence on the nano- to mesoscopic scale. This novel observation is a fundamentally dynamic manifestation of the first-order character of the insulator-to-metal transition, which the nanoscale thickness of our films and their fast cooling rate enable us to detect. The large transients seen in our films are promising for fast electronic (and magnetic) switching applications.
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Affiliation(s)
- E Abreu
- Institute for Quantum Electronics, Department of Physics, ETH Zurich, 8093 Zurich, Switzerland
| | - D Meyers
- Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - V K Thorsmølle
- Department of Physics, Boston University, Boston, Massachusetts 02215, United States
- Department of Physics, UC San Diego, La Jolla, California 92093, United States
| | - J Zhang
- Department of Physics, UC San Diego, La Jolla, California 92093, United States
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - X Liu
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, United States
| | - K Geng
- Department of Physics, Boston University, Boston, Massachusetts 02215, United States
| | - J Chakhalian
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, United States
| | - R D Averitt
- Department of Physics, UC San Diego, La Jolla, California 92093, United States
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10
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Jang H, Kim HD, Kim M, Park SH, Kwon S, Lee JY, Park SY, Park G, Kim S, Hyun H, Hwang S, Lee CS, Lim CY, Gang W, Kim M, Heo S, Kim J, Jung G, Kim S, Park J, Kim J, Shin H, Park J, Koo TY, Shin HJ, Heo H, Kim C, Min CK, Han JH, Kang HS, Lee HS, Kim KS, Eom I, Rah S. Time-resolved resonant elastic soft x-ray scattering at Pohang Accelerator Laboratory X-ray Free Electron Laser. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:083904. [PMID: 32872965 DOI: 10.1063/5.0016414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Resonant elastic x-ray scattering has been widely employed for exploring complex electronic ordering phenomena, such as charge, spin, and orbital order, in particular, in strongly correlated electronic systems. In addition, recent developments in pump-probe x-ray scattering allow us to expand the investigation of the temporal dynamics of such orders. Here, we introduce a new time-resolved Resonant Soft X-ray Scattering (tr-RSXS) endstation developed at the Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL). This endstation has an optical laser (wavelength of 800 nm plus harmonics) as the pump source. Based on the commissioning results, the tr-RSXS at PAL-XFEL can deliver a soft x-ray probe (400 eV-1300 eV) with a time resolution of ∼100 fs without jitter correction. As an example, the temporal dynamics of a charge density wave on a high-temperature cuprate superconductor is demonstrated.
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Affiliation(s)
- Hoyoung Jang
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Hyeong-Do Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Minseok Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Sang Han Park
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Soonnam Kwon
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Ju Yeop Lee
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Sang-Youn Park
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Gisu Park
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Seonghan Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - HyoJung Hyun
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Sunmin Hwang
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Chae-Soon Lee
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Chae-Yong Lim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Wonup Gang
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Myeongjin Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Seongbeom Heo
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Jinhong Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Gigun Jung
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Seungnam Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Jaeku Park
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Jihwa Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Hocheol Shin
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Jaehun Park
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Tae-Yeong Koo
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Hyun-Joon Shin
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Hoon Heo
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Changbum Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Changi-Ki Min
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Jang-Hui Han
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Heung-Sik Kang
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Heung-Soo Lee
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Kyung Sook Kim
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Intae Eom
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Seungyu Rah
- PAL-XFEL, Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
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11
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Ultrafast magnetic dynamics in insulating YBa 2Cu 3O 6.1 revealed by time resolved two-magnon Raman scattering. Nat Commun 2020; 11:2548. [PMID: 32439836 PMCID: PMC7242324 DOI: 10.1038/s41467-020-16275-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 04/24/2020] [Indexed: 11/08/2022] Open
Abstract
Measurement and control of magnetic order and correlations in real time is a rapidly developing scientific area relevant for magnetic memory and spintronics. In these experiments an ultrashort laser pulse (pump) is first absorbed by excitations carrying electric dipole moment. These then give their energy to the magnetic subsystem monitored by a time-resolved probe. A lot of progress has been made in investigations of ferromagnets but antiferromagnets are more challenging. Here, we introduce time-resolved two-magnon Raman scattering as a real time probe of magnetic correlations especially well-suited for antiferromagnets. Its application to the antiferromagnetic charge transfer insulator YBa2Cu3O6.1 revealed rapid demagnetization within 90 fs of photoexcitation. The relaxation back to thermal equilibrium is characterized by much slower timescales. We interpret these results in terms of slow relaxation of the charge sector and rapid equilibration of the magnetic sector to a prethermal state characterized by parameters that change slowly as the charge sector relaxes.
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12
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Storeck G, Horstmann JG, Diekmann T, Vogelgesang S, von Witte G, Yalunin SV, Rossnagel K, Ropers C. Structural dynamics of incommensurate charge-density waves tracked by ultrafast low-energy electron diffraction. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2020; 7:034304. [PMID: 32596414 PMCID: PMC7311179 DOI: 10.1063/4.0000018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
We study the non-equilibrium structural dynamics of the incommensurate and nearly commensurate charge-density wave (CDW) phases in 1T-TaS 2 . Employing ultrafast low-energy electron diffraction with 1 ps temporal resolution, we investigate the ultrafast quench and recovery of the CDW-coupled periodic lattice distortion (PLD). Sequential structural relaxation processes are observed by tracking the intensities of main lattice as well as satellite diffraction peaks and the diffuse scattering background. Comparing distinct groups of diffraction peaks, we disentangle the ultrafast quench of the PLD amplitude from phonon-related reductions of the diffraction intensity. Fluence-dependent relaxation cycles reveal a long-lived partial suppression of the order parameter for up to 60 ps, far outlasting the initial amplitude recovery and electron-phonon scattering times. This delayed return to a quasi-thermal level is controlled by lattice thermalization and coincides with the population of zone-center acoustic modes, as evidenced by a structured diffuse background. The long-lived non-equilibrium order parameter suppression suggests hot populations of CDW-coupled lattice modes. Finally, a broadening of the superlattice peaks is observed at high fluences, pointing to a non-linear generation of phase fluctuations.
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Affiliation(s)
- G. Storeck
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, 37077 Göttingen, Germany
| | - J. G. Horstmann
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, 37077 Göttingen, Germany
| | - T. Diekmann
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, 37077 Göttingen, Germany
| | - S. Vogelgesang
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, 37077 Göttingen, Germany
| | - G. von Witte
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, 37077 Göttingen, Germany
| | - S. V. Yalunin
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, 37077 Göttingen, Germany
| | | | - C. Ropers
- Author to whom correspondence should be addressed:
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13
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Mitrano M, Lee S, Husain AA, Delacretaz L, Zhu M, de la Peña Munoz G, Sun SXL, Joe YI, Reid AH, Wandel SF, Coslovich G, Schlotter W, van Driel T, Schneeloch J, Gu GD, Hartnoll S, Goldenfeld N, Abbamonte P. Ultrafast time-resolved x-ray scattering reveals diffusive charge order dynamics in La 2-x Ba x CuO 4. SCIENCE ADVANCES 2019; 5:eaax3346. [PMID: 31453340 PMCID: PMC6697434 DOI: 10.1126/sciadv.aax3346] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 07/03/2019] [Indexed: 05/23/2023]
Abstract
Charge order is universal among high-T c cuprates, but its relation to superconductivity is unclear. While static order competes with superconductivity, dynamic order may be favorable and even contribute to Cooper pairing. Using time-resolved resonant soft x-ray scattering at a free-electron laser, we show that the charge order in prototypical La2-x Ba x CuO4 exhibits transverse fluctuations at picosecond time scales. These sub-millielectron volt excitations propagate by Brownian-like diffusion and have an energy scale remarkably close to the superconducting T c. At sub-millielectron volt energy scales, the dynamics are governed by universal scaling laws defined by the propagation of topological defects. Our results show that charge order in La2-x Ba x CuO4 exhibits dynamics favorable to the in-plane superconducting tunneling and establish time-resolved x-rays as a means to study excitations at energy scales inaccessible to conventional scattering techniques.
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Affiliation(s)
- Matteo Mitrano
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Sangjun Lee
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Ali A. Husain
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Luca Delacretaz
- Department of Physics, Stanford University, Stanford, CA 94305-4060, USA
| | - Minhui Zhu
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | | | - Stella X.-L. Sun
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Young Il Joe
- National Institute of Standards and Technology, Boulder, CO 80305, USA
| | - Alexander H. Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Scott F. Wandel
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Giacomo Coslovich
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - William Schlotter
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Tim van Driel
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - John Schneeloch
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - G. D. Gu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Sean Hartnoll
- Department of Physics, Stanford University, Stanford, CA 94305-4060, USA
| | - Nigel Goldenfeld
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Peter Abbamonte
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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14
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Deng S, Wu L, Cheng H, Zheng JC, Cheng S, Li J, Wang W, Shen J, Tao J, Zhu J, Zhu Y. Charge-Lattice Coupling in Hole-Doped LuFe_{2}O_{4+δ}: The Origin of Second-Order Modulation. PHYSICAL REVIEW LETTERS 2019; 122:126401. [PMID: 30978042 DOI: 10.1103/physrevlett.122.126401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 01/20/2019] [Indexed: 06/09/2023]
Abstract
Understanding singularities in ordered structures, such as dislocations in lattice modulation and solitons in charge ordering, offers great opportunities to disentangle the interactions between the electronic degrees of freedom and the lattice. Specifically, a modulated structure has traditionally been expressed in the form of a discrete Fourier series with a constant phase and amplitude for each component. Here, we report atomic scale observation and analysis of a new modulation wave in hole-doped LuFe_{2}O_{4+δ} that requires significant modifications to the conventional modeling of ordered structures. This new modulation with an unusual quasiperiodic singularity can be accurately described only by introducing a well-defined secondary modulation vector in both the phase and amplitude parameter spaces. Correlated with density-functional-theory (DFT) calculations, our results reveal that those singularities originate from the discontinuity of lattice displacement induced by interstitial oxygen in the system. The approach of our work is applicable to a wide range of ordered systems, advancing our understanding of the nature of singularity and modulation.
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Affiliation(s)
- Shiqing Deng
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Lijun Wu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Hao Cheng
- Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China
| | - Jin-Cheng Zheng
- Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China
| | - Shaobo Cheng
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Jun Li
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Wenbin Wang
- Institute of Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, People's Republic of China
| | - Jian Shen
- Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | - Jing Tao
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Jing Zhu
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yimei Zhu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
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15
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Zong A, Shen X, Kogar A, Ye L, Marks C, Chowdhury D, Rohwer T, Freelon B, Weathersby S, Li R, Yang J, Checkelsky J, Wang X, Gedik N. Ultrafast manipulation of mirror domain walls in a charge density wave. SCIENCE ADVANCES 2018; 4:eaau5501. [PMID: 30345365 PMCID: PMC6195337 DOI: 10.1126/sciadv.aau5501] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 09/07/2018] [Indexed: 05/02/2023]
Abstract
Domain walls (DWs) are singularities in an ordered medium that often host exotic phenomena such as charge ordering, insulator-metal transition, or superconductivity. The ability to locally write and erase DWs is highly desirable, as it allows one to design material functionality by patterning DWs in specific configurations. We demonstrate such capability at room temperature in a charge density wave (CDW), a macroscopic condensate of electrons and phonons, in ultrathin 1T-TaS2. A single femtosecond light pulse is shown to locally inject or remove mirror DWs in the CDW condensate, with probabilities tunable by pulse energy and temperature. Using time-resolved electron diffraction, we are able to simultaneously track anti-synchronized CDW amplitude oscillations from both the lattice and the condensate, where photoinjected DWs lead to a red-shifted frequency. Our demonstration of reversible DW manipulation may pave new ways for engineering correlated material systems with light.
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Affiliation(s)
- Alfred Zong
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Xiaozhe Shen
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Anshul Kogar
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Linda Ye
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Carolyn Marks
- Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA
| | - Debanjan Chowdhury
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Timm Rohwer
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Byron Freelon
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | | | - Renkai Li
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Jie Yang
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Joseph Checkelsky
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Xijie Wang
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Nuh Gedik
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Corresponding author.
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16
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Wang Y, Chen CC, Moritz B, Devereaux TP. Light-Enhanced Spin Fluctuations and d-Wave Superconductivity at a Phase Boundary. PHYSICAL REVIEW LETTERS 2018; 120:246402. [PMID: 29957014 DOI: 10.1103/physrevlett.120.246402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Indexed: 06/08/2023]
Abstract
Time-domain techniques have shown the potential of photomanipulating existing orders and inducing new states of matter in strongly correlated materials. Using time-resolved exact diagonalization, we perform numerical studies of pump dynamics in a Mott-Peierls system with competing charge and spin density waves. A light-enhanced d-wave superconductivity is observed when the system resides near a quantum phase boundary. By examining the evolution of spin, charge, and superconducting susceptibilities, we show that a subdominant state in equilibrium can be stabilized by photomanipulating the charge order to allow superconductivity to appear and dominate. This work provides an interpretation of light-induced superconductivity from the perspective of order competition and offers a promising approach for designing novel emergent states out of equilibrium.
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Affiliation(s)
- Yao Wang
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Cheng-Chien Chen
- Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - B Moritz
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA
| | - T P Devereaux
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
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17
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Unconventional slowing down of electronic recovery in photoexcited charge-ordered La 1/3Sr 2/3FeO 3. Nat Commun 2018; 9:1799. [PMID: 29728580 PMCID: PMC5935711 DOI: 10.1038/s41467-018-04199-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 04/11/2018] [Indexed: 12/03/2022] Open
Abstract
The coupling of ordered electronic phases with lattice, spin, and orbital degrees of freedom are of central interest in strongly correlated systems. Their interplay has been intensively studied from femtosecond to picosecond time scales, while their dynamics beyond nanoseconds are usually assumed to follow lattice cooling. Here, we report an unusual slowing down of the recovery of an electronic phase across a first-order phase transition. Following optical excitation, the recovery time of both transient optical reflectivity and X-ray diffraction intensity from the charge-ordered superstructure in a La1/3Sr2/3FeO3 thin film increases by orders of magnitude as the sample temperature approaches the phase transition temperature. In this regime, the recovery time becomes much longer than the lattice cooling time. The combined experimental and theoretical investigation shows that the slowing down of electronic recovery corresponds to the pseudo-critical dynamics that originates from magnetic interactions close to a weakly first-order phase transition. Unusual electronic behavior can emerge in complex oxides due to strong coupling between charge, magnetic and lattice degrees of freedom. Zhu et al. observe separation of electronic and lattice equilibration times in La1/3Sr2/3FeO3 as magnetic interactions make the recovery of charge order much slower than lattice relaxation.
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18
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Coslovich G, Kemper AF, Behl S, Huber B, Bechtel HA, Sasagawa T, Martin MC, Lanzara A, Kaindl RA. Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate. SCIENCE ADVANCES 2017; 3:e1600735. [PMID: 29202025 PMCID: PMC5706742 DOI: 10.1126/sciadv.1600735] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 11/02/2017] [Indexed: 06/07/2023]
Abstract
The ability to probe symmetry-breaking transitions on their natural time scales is one of the key challenges in nonequilibrium physics. Stripe ordering represents an intriguing type of broken symmetry, where complex interactions result in atomic-scale lines of charge and spin density. Although phonon anomalies and periodic distortions attest the importance of electron-phonon coupling in the formation of stripe phases, a direct time-domain view of vibrational symmetry breaking is lacking. We report experiments that track the transient multi-terahertz response of the model stripe compound La1.75Sr0.25NiO4, yielding novel insight into its electronic and structural dynamics following an ultrafast optical quench. We find that although electronic carriers are immediately delocalized, the crystal symmetry remains initially frozen-as witnessed by time-delayed suppression of zone-folded Ni-O bending modes acting as a fingerprint of lattice symmetry. Longitudinal and transverse vibrations react with different speeds, indicating a strong directionality and an important role of polar interactions. The hidden complexity of electronic and structural coupling during stripe melting and formation, captured here within a single terahertz spectrum, opens new paths to understanding symmetry-breaking dynamics in solids.
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Affiliation(s)
- Giacomo Coslovich
- Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Alexander F. Kemper
- Computational Research Division, E.O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
| | - Sascha Behl
- Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
| | - Bernhard Huber
- Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
| | - Hans A. Bechtel
- Advanced Light Source, E.O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Takao Sasagawa
- Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
| | - Michael C. Martin
- Advanced Light Source, E.O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Alessandra Lanzara
- Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
- Department of Physics, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Robert A. Kaindl
- Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
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19
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Abela R, Beaud P, van Bokhoven JA, Chergui M, Feurer T, Haase J, Ingold G, Johnson SL, Knopp G, Lemke H, Milne CJ, Pedrini B, Radi P, Schertler G, Standfuss J, Staub U, Patthey L. Perspective: Opportunities for ultrafast science at SwissFEL. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2017; 4:061602. [PMID: 29376109 PMCID: PMC5758366 DOI: 10.1063/1.4997222] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Accepted: 10/17/2017] [Indexed: 05/03/2023]
Abstract
We present the main specifications of the newly constructed Swiss Free Electron Laser, SwissFEL, and explore its potential impact on ultrafast science. In light of recent achievements at current X-ray free electron lasers, we discuss the potential territory for new scientific breakthroughs offered by SwissFEL in Chemistry, Biology, and Materials Science, as well as nonlinear X-ray science.
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Affiliation(s)
- Rafael Abela
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Paul Beaud
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Jeroen A van Bokhoven
- Laboratory for Catalysis and Sustainable Chemistry, Paul-Scherrer Institute, 5232 Villigen PSI, and Department of Chemistry, ETH-Zürich, 8093 Zürich, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast Science (LACUS), Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-FSB, Station 6, 1015 Lausanne, Switzerland
| | - Thomas Feurer
- Institute of Applied Physics, University of Bern, Bern, Switzerland
| | - Johannes Haase
- Laboratory for Catalysis and Sustainable Chemistry, Paul-Scherrer Institute, 5232 Villigen PSI, and Department of Chemistry, ETH-Zürich, 8093 Zürich, Switzerland
| | - Gerhard Ingold
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Steven L Johnson
- Institute for Quantum Electronics, Eidgenössische Technische Hochschule (ETH) Zürich, 8093 Zurich, Switzerland
| | - Gregor Knopp
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Henrik Lemke
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Chris J Milne
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Bill Pedrini
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Peter Radi
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
| | | | - Jörg Standfuss
- Division of Biology and Chemistry, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Urs Staub
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Luc Patthey
- SwissFEL, Paul-Scherrer Institute, 5232 Villigen PSI, Switzerland
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20
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Zhong R, Winn BL, Gu G, Reznik D, Tranquada JM. Evidence for a Nematic Phase in La_{1.75}Sr_{0.25}NiO_{4}. PHYSICAL REVIEW LETTERS 2017; 118:177601. [PMID: 28498689 DOI: 10.1103/physrevlett.118.177601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Indexed: 06/07/2023]
Abstract
Determining the nature of electronic states in doped Mott insulators remains a challenging task. In the case of tetragonal La_{2-x}Sr_{x}NiO_{4}, the occurrence of diagonal charge and spin stripe order in the ground state is now well established. In contrast, the nature of the high-temperature "disordered" state from which the stripe order develops has long been a subject of controversy, with considerable speculation regarding a polaronic liquid. Following the recent detection of dynamic charge stripes, we use neutron scattering measurements on an x=0.25 crystal to demonstrate that the dispersion of the charge-stripe excitations is anisotropic. This observation provides compelling evidence for the presence of electronic nematic order.
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Affiliation(s)
- Ruidan Zhong
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
- Materials Science and Engineering Department, Stony Brook University, Stony Brook, New York 11794, USA
| | - Barry L Winn
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Genda Gu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Dmitry Reznik
- Department of Physics, University of Colorado, Boulder, Colorado 80304, USA
| | - J M Tranquada
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
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21
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Dean MPM, Cao Y, Liu X, Wall S, Zhu D, Mankowsky R, Thampy V, Chen XM, Vale JG, Casa D, Kim J, Said AH, Juhas P, Alonso-Mori R, Glownia JM, Robert A, Robinson J, Sikorski M, Song S, Kozina M, Lemke H, Patthey L, Owada S, Katayama T, Yabashi M, Tanaka Y, Togashi T, Liu J, Rayan Serrao C, Kim BJ, Huber L, Chang CL, McMorrow DF, Först M, Hill JP. Ultrafast energy- and momentum-resolved dynamics of magnetic correlations in the photo-doped Mott insulator Sr2IrO4. NATURE MATERIALS 2016; 15:601-5. [PMID: 27159018 DOI: 10.1038/nmat4641] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 04/07/2016] [Indexed: 05/07/2023]
Abstract
Measuring how the magnetic correlations evolve in doped Mott insulators has greatly improved our understanding of the pseudogap, non-Fermi liquids and high-temperature superconductivity. Recently, photo-excitation has been used to induce similarly exotic states transiently. However, the lack of available probes of magnetic correlations in the time domain hinders our understanding of these photo-induced states and how they could be controlled. Here, we implement magnetic resonant inelastic X-ray scattering at a free-electron laser to directly determine the magnetic dynamics after photo-doping the Mott insulator Sr2IrO4. We find that the non-equilibrium state, 2 ps after the excitation, exhibits strongly suppressed long-range magnetic order, but hosts photo-carriers that induce strong, non-thermal magnetic correlations. These two-dimensional (2D) in-plane Néel correlations recover within a few picoseconds, whereas the three-dimensional (3D) long-range magnetic order restores on a fluence-dependent timescale of a few hundred picoseconds. The marked difference in these two timescales implies that the dimensionality of magnetic correlations is vital for our understanding of ultrafast magnetic dynamics.
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Affiliation(s)
- M P M Dean
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Y Cao
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - S Wall
- ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
| | - D Zhu
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - R Mankowsky
- Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany
- Center for Free Electron Laser Science, D-22761 Hamburg, Germany
| | - V Thampy
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X M Chen
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J G Vale
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
| | - D Casa
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Jungho Kim
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A H Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - P Juhas
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - R Alonso-Mori
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J M Glownia
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A Robert
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J Robinson
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M Sikorski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - S Song
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M Kozina
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - H Lemke
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - L Patthey
- SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - S Owada
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - T Katayama
- Japan Synchrotron Radiation Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - M Yabashi
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | | | - T Togashi
- Japan Synchrotron Radiation Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - J Liu
- Department of Physics &Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C Rayan Serrao
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA
| | - B J Kim
- Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
| | - L Huber
- Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland
| | - C-L Chang
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, NL 9747AG, The Netherlands
| | - D F McMorrow
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
| | - M Först
- Max Planck Institute for the Structure and Dynamics of Matter, D-22761 Hamburg, Germany
- Center for Free Electron Laser Science, D-22761 Hamburg, Germany
| | - J P Hill
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA
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22
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Wang L, Dash S, Chang L, You L, Feng Y, He X, Jin KJ, Zhou Y, Ong HG, Ren P, Wang S, Chen L, Wang J. Oxygen Vacancy Induced Room-Temperature Metal-Insulator Transition in Nickelate Films and Its Potential Application in Photovoltaics. ACS APPLIED MATERIALS & INTERFACES 2016; 8:9769-9776. [PMID: 27025257 DOI: 10.1021/acsami.6b00650] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Oxygen vacancy is intrinsically coupled with magnetic, electronic, and transport properties of transition-metal oxide materials and directly determines their multifunctionality. Here, we demonstrate reversible control of oxygen content by postannealing at temperature lower than 300 °C and realize the reversible metal-insulator transition in epitaxial NdNiO₃ films. Importantly, over 6 orders of magnitude in the resistance modulation and a large change in optical bandgap are demonstrated at room temperature without destroying the parent framework and changing the p-type conductive mechanism. Further study revealed that oxygen vacancies stabilized the insulating phase at room temperature is universal for perovskite nickelate films. Acting as electron donors, oxygen vacancies not only stabilize the insulating phase at room temperature, but also induce a large magnetization of ∼50 emu/cm³ due to the formation of strongly correlated Ni²⁺ t(2g)⁶e(g)² states. The bandgap opening is an order of magnitude larger than that of the thermally driven metal-insulator transition and continuously tunable. Potential application of the newly found insulating phase in photovoltaics has been demonstrated in the nickelate-based heterojunctions. Our discovery opens up new possibilities for strongly correlated perovskite nickelates.
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Affiliation(s)
- Le Wang
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Sibashisa Dash
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Lei Chang
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Lu You
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Yaqing Feng
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Xu He
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Kui-juan Jin
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
- Collaborative Innovation Center of Quantum Matter , Beijing 100190, China
| | - Yang Zhou
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Hock Guan Ong
- Temasek Laboratories@NTU, Nanyang Technological University , 637553, Singapore
| | - Peng Ren
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Shiwei Wang
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
| | - Lang Chen
- Department of Physics, South University of Science and Technology of China , Shen Zhen 518055, China
| | - Junling Wang
- School of Materials Science and Engineering, Nanyang Technological University , 639798, Singapore
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23
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Wang Y, Moritz B, Chen CC, Jia CJ, van Veenendaal M, Devereaux TP. Using Nonequilibrium Dynamics to Probe Competing Orders in a Mott-Peierls System. PHYSICAL REVIEW LETTERS 2016; 116:086401. [PMID: 26967429 DOI: 10.1103/physrevlett.116.086401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Indexed: 06/05/2023]
Abstract
Competition between ordered phases, and their associated phase transitions, are significant in the study of strongly correlated systems. Here, we examine one aspect, the nonequilibrium dynamics of a photoexcited Mott-Peierls system, using an effective Peierls-Hubbard model and exact diagonalization. Near a transition where spin and charge become strongly intertwined, we observe antiphase dynamics and a coupling-strength-dependent suppression or enhancement in the static structure factors. The renormalized bosonic excitations coupled to a particular photoexcited electron can be extracted, which provides an approach for characterizing the underlying bosonic modes. The results from this analysis for different electronic momenta show an uneven softening due to a stronger coupling near k_{F}. This behavior reflects the strong link between the fermionic momenta, the coupling vertices, and ultimately, the bosonic susceptibilities when multiple phases compete for the ground state of the system.
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Affiliation(s)
- Y Wang
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - B Moritz
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA
| | - C-C Chen
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C J Jia
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M van Veenendaal
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA
| | - T P Devereaux
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
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24
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Wang L, Ju S, You L, Qi Y, Guo YW, Ren P, Zhou Y, Wang J. Competition between strain and dimensionality effects on the electronic phase transitions in NdNiO3 films. Sci Rep 2015; 5:18707. [PMID: 26687924 PMCID: PMC4685315 DOI: 10.1038/srep18707] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 11/23/2015] [Indexed: 11/08/2022] Open
Abstract
Transition metal oxides host an array of exotic electronic phases, including superconductivity, ferroelectricity, quantum spin liquid and Mott insulators. Their extreme sensitivity to external stimuli enables various routes to manipulate the ground state, which greatly improves our understanding of the physics involved. Here, we report the competition between strain and dimensionality effects on the phase evolution in high quality NdNiO3 films down to several unit cells. While both compressive and tensile strains increase the Ni 3d band width and favor the metallic phase, reducing dimensionality, on the other hand, decreases the covalent band width and favors the insulating phase in NdNiO3. The experimental observations are well supported by ab initio calculations and improve our understanding of the electronic behavior in strongly correlated electron systems.
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Affiliation(s)
- Le Wang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Sheng Ju
- School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Lu You
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Yajun Qi
- School of Materials Science and Engineering, Hubei University, Wuhan 430062, China
| | - Yu-wei Guo
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Peng Ren
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Yang Zhou
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Junling Wang
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
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25
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Li Y, Walko DA, Li Q, Liu Y, Rosenkranz S, Zheng H, Mitchell JF. Evidence of photo-induced dynamic competition of metallic and insulating phase in a layered manganite. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:495602. [PMID: 26575485 DOI: 10.1088/0953-8984/27/49/495602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We show evidence that the competition between the antiferromagetic metallic phase and the charge- and orbital-ordered insulating phase at the reentrant phase boundary of a layered manganite, La0.99Sr2.01Mn2O7, can be manipulated using ultrafast optical excitation. The time-dependent evolution of the Jahn-Teller superlattice reflection, which indicates the formation of the charge and orbital order, was measured at different laser fluences. The laser-induced enhancement and reduction the Jahn-Teller reflection intensity shows a reversal of sign between earlier (~10 ns) and later (~150 ns) time delays during the relaxation after photo excitation. This effect is consistent with a scenario whereby the laser excitation modulates the local competition between the metallic and the insulating phases.
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Affiliation(s)
- Yuelin Li
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
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26
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Ekimova M, Quevedo W, Faubel M, Wernet P, Nibbering ETJ. A liquid flatjet system for solution phase soft-x-ray spectroscopy. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2015; 2:054301. [PMID: 26798824 PMCID: PMC4711648 DOI: 10.1063/1.4928715] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Accepted: 08/06/2015] [Indexed: 05/05/2023]
Abstract
We present a liquid flatjet system for solution phase soft-x-ray spectroscopy. The flatjet set-up utilises the phenomenon of formation of stable liquid sheets upon collision of two identical laminar jets. Colliding the two single water jets, coming out of the nozzles with 50 μm orifices, under an impact angle of 48° leads to double sheet formation, of which the first sheet is 4.6 mm long and 1.0 mm wide. The liquid flatjet operates fully functional under vacuum conditions (<10(-3) mbar), allowing soft-x-ray spectroscopy of aqueous solutions in transmission mode. We analyse the liquid water flatjet thickness under atmospheric pressure using interferomeric or mid-infrared transmission measurements and under vacuum conditions by measuring the absorbance of the O K-edge of water in transmission, and comparing our results with previously published data obtained with standing cells with Si3N4 membrane windows. The thickness of the first liquid sheet is found to vary between 1.4-3 μm, depending on the transverse and longitudinal position in the liquid sheet. We observe that the derived thickness is of similar magnitude under 1 bar and under vacuum conditions. A catcher unit facilitates the recycling of the solutions, allowing measurements on small sample volumes (∼10 ml). We demonstrate the applicability of this approach by presenting measurements on the N K-edge of aqueous NH4 (+). Our results suggest the high potential of using liquid flatjets in steady-state and time-resolved studies in the soft-x-ray regime.
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Affiliation(s)
- Maria Ekimova
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie , Max-Born-Str. 2A, 12489 Berlin, Germany
| | - Wilson Quevedo
- Institute for Methods and Instrumentation for Synchrotron Radiation Research , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Manfred Faubel
- Max-Planck-Institut für Dynamik und Selbstorganisation , Am Fassberg 17, 37077 Göttingen, Germany
| | - Philippe Wernet
- Institute for Methods and Instrumentation for Synchrotron Radiation Research , Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Erik T J Nibbering
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie , Max-Born-Str. 2A, 12489 Berlin, Germany
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27
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Blaj G, Caragiulo P, Carini G, Carron S, Dragone A, Freytag D, Haller G, Hart P, Hasi J, Herbst R, Herrmann S, Kenney C, Markovic B, Nishimura K, Osier S, Pines J, Reese B, Segal J, Tomada A, Weaver M. X-ray detectors at the Linac Coherent Light Source. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:577-83. [PMID: 25931071 PMCID: PMC4416673 DOI: 10.1107/s1600577515005317] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 03/15/2015] [Indexed: 05/21/2023]
Abstract
Free-electron lasers (FELs) present new challenges for camera development compared with conventional light sources. At SLAC a variety of technologies are being used to match the demands of the Linac Coherent Light Source (LCLS) and to support a wide range of scientific applications. In this paper an overview of X-ray detector design requirements at FELs is presented and the various cameras in use at SLAC are described for the benefit of users planning experiments or analysts looking at data. Features and operation of the CSPAD camera, which is currently deployed at LCLS, are discussed, and the ePix family, a new generation of cameras under development at SLAC, is introduced.
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Affiliation(s)
- Gabriel Blaj
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Pietro Caragiulo
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Gabriella Carini
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Sebastian Carron
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Angelo Dragone
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Dietrich Freytag
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Gunther Haller
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Philip Hart
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Jasmine Hasi
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Ryan Herbst
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Sven Herrmann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Chris Kenney
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Bojan Markovic
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Kurtis Nishimura
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Shawn Osier
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Jack Pines
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Benjamin Reese
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Julie Segal
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Astrid Tomada
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Matt Weaver
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
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28
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Turner JJ, Dakovski GL, Hoffmann MC, Hwang HY, Zarem A, Schlotter WF, Moeller S, Minitti MP, Staub U, Johnson S, Mitra A, Swiggers M, Noonan P, Curiel GI, Holmes M. Combining THz laser excitation with resonant soft X-ray scattering at the Linac Coherent Light Source. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:621-5. [PMID: 25931077 PMCID: PMC4416678 DOI: 10.1107/s1600577515005998] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 03/24/2015] [Indexed: 05/10/2023]
Abstract
This paper describes the development of new instrumentation at the Linac Coherent Light Source for conducting THz excitation experiments in an ultra high vacuum environment probed by soft X-ray diffraction. This consists of a cantilevered, fully motorized mirror system which can provide 600 kV cm(-1) electric field strengths across the sample and an X-ray detector that can span the full Ewald sphere with in-vacuum motion. The scientific applications motivated by this development, the details of the instrument, and spectra demonstrating the field strengths achieved using this newly developed system are discussed.
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Affiliation(s)
- Joshua J. Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Georgi L. Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Matthias C. Hoffmann
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Harold Y. Hwang
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Alex Zarem
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - William F. Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Stefan Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Michael P. Minitti
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Urs Staub
- Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Steven Johnson
- ETH Zurich, Institute for Quantum Electronics, Wolfgang-Pauli-Strasse 16, 8093 Zurich, Switzerland
| | - Ankush Mitra
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Michele Swiggers
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Peter Noonan
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - G. Ivan Curiel
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Michael Holmes
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
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29
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Elsaesser T, Woerner M. Perspective: structural dynamics in condensed matter mapped by femtosecond x-ray diffraction. J Chem Phys 2014; 140:020901. [PMID: 24437858 DOI: 10.1063/1.4855115] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Ultrashort soft and hard x-ray pulses are sensitive probes of structural dynamics on the picometer length and femtosecond time scales of electronic and atomic motions. Recent progress in generating such pulses has initiated new directions of condensed matter research, exploiting a variety of x-ray absorption, scattering, and diffraction methods to probe photoinduced structural dynamics. Atomic motion, changes of local structure and long-range order, as well as correlated electron motion and charge transfer have been resolved in space and time, providing a most direct access to the physical mechanisms and interactions driving reversible and irreversible changes of structure. This perspective combines an overview of recent advances in femtosecond x-ray diffraction with a discussion on ongoing and future developments.
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Affiliation(s)
- T Elsaesser
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany
| | - M Woerner
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany
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30
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Holldack K, Bahrdt J, Balzer A, Bovensiepen U, Brzhezinskaya M, Erko A, Eschenlohr A, Follath R, Firsov A, Frentrup W, Le Guyader L, Kachel T, Kuske P, Mitzner R, Müller R, Pontius N, Quast T, Radu I, Schmidt JS, Schüssler-Langeheine C, Sperling M, Stamm C, Trabant C, Föhlisch A. FemtoSpeX: a versatile optical pump-soft X-ray probe facility with 100 fs X-ray pulses of variable polarization. JOURNAL OF SYNCHROTRON RADIATION 2014; 21:1090-1104. [PMID: 25177998 DOI: 10.1107/s1600577514012247] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 05/27/2014] [Indexed: 06/03/2023]
Abstract
Here the major upgrades of the femtoslicing facility at BESSY II (Khan et al., 2006) are reviewed, giving a tutorial on how elliptical-polarized ultrashort soft X-ray pulses from electron storage rings are generated at high repetition rates. Employing a 6 kHz femtosecond-laser system consisting of two amplifiers that are seeded by one Ti:Sa oscillator, the total average flux of photons of 100 fs duration (FWHM) has been increased by a factor of 120 to up to 10(6) photons s(-1) (0.1% bandwidth)(-1) on the sample in the range from 250 to 1400 eV. Thanks to a new beamline design, a factor of 20 enhanced flux and improvements of the stability together with the top-up mode of the accelerator have been achieved. The previously unavoidable problem of increased picosecond-background at higher repetition rates, caused by `halo' photons, has also been solved by hopping between different `camshaft' bunches in a dedicated fill pattern (`3+1 camshaft fill') of the storage ring. In addition to an increased X-ray performance at variable (linear and elliptical) polarization, the sample excitation in pump-probe experiments has been considerably extended using an optical parametric amplifier that supports the range from the near-UV to the far-IR regime. Dedicated endstations covering ultrafast magnetism experiments based on time-resolved X-ray circular dichroism have been either upgraded or, in the case of time-resolved resonant soft X-ray diffraction and reflection, newly constructed and adapted to femtoslicing requirements. Experiments at low temperatures down to 6 K and magnetic fields up to 0.5 T are supported. The FemtoSpeX facility is now operated as a 24 h user facility enabling a new class of experiments in ultrafast magnetism and in the field of transient phenomena and phase transitions in solids.
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Affiliation(s)
- Karsten Holldack
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Johannes Bahrdt
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Andreas Balzer
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Uwe Bovensiepen
- Fakultät für Physik, Universität Duisburg-Essen, Lotharstrasse 1, Duisburg 47048, Germany
| | - Maria Brzhezinskaya
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Alexei Erko
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Andrea Eschenlohr
- Fakultät für Physik, Universität Duisburg-Essen, Lotharstrasse 1, Duisburg 47048, Germany
| | - Rolf Follath
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Alexander Firsov
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Winfried Frentrup
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Loïc Le Guyader
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Torsten Kachel
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Peter Kuske
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Rolf Mitzner
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Roland Müller
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Niko Pontius
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Torsten Quast
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Ilie Radu
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Jan Simon Schmidt
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | | | - Mike Sperling
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Christian Stamm
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Christoph Trabant
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Alexander Föhlisch
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
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31
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32
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Först M, Tobey RI, Bromberger H, Wilkins SB, Khanna V, Caviglia AD, Chuang YD, Lee WS, Schlotter WF, Turner JJ, Minitti MP, Krupin O, Xu ZJ, Wen JS, Gu GD, Dhesi SS, Cavalleri A, Hill JP. Melting of charge stripes in vibrationally driven La(1.875)Ba(0.125)CuO4: assessing the respective roles of electronic and lattice order in frustrated superconductors. PHYSICAL REVIEW LETTERS 2014; 112:157002. [PMID: 24785066 DOI: 10.1103/physrevlett.112.157002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Indexed: 05/19/2023]
Abstract
We report femtosecond resonant soft x-ray diffraction measurements of the dynamics of the charge order and of the crystal lattice in nonsuperconducting, stripe-ordered La1.875Ba0.125CuO4. Excitation of the in-plane Cu-O stretching phonon with a midinfrared pulse has been previously shown to induce a transient superconducting state in the closely related compound La1.675Eu0.2Sr0.125CuO4. In La1.875Ba0.125CuO4, we find that the charge stripe order melts promptly on a subpicosecond time scale. Surprisingly, the low temperature tetragonal (LTT) distortion is only weakly reduced, reacting on significantly longer time scales that do not correlate with light-induced superconductivity. This experiment suggests that charge modulations alone, and not the LTT distortion, prevent superconductivity in equilibrium.
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Affiliation(s)
- M Först
- Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
| | - R I Tobey
- Zernike Institute for Advanced Materials, University of Groningen, 9747AG Groningen, Netherlands
| | - H Bromberger
- Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
| | - S B Wilkins
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - V Khanna
- Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom and Diamond Light Source, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - A D Caviglia
- Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
| | - Y-D Chuang
- Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley 94720, California, USA
| | - W S Lee
- SIMES, SLAC National Accelerator Laboratory and Stanford University, Menlo Park 94025, California, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park 94025, California, USA
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park 94025, California, USA
| | - M P Minitti
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park 94025, California, USA
| | - O Krupin
- European XFEL GmbH, 22761 Hamburg, Germany
| | - Z J Xu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J S Wen
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - G D Gu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - S S Dhesi
- Diamond Light Source, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - A Cavalleri
- Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany and Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom and Center for Free Electron Laser Science and University of Hamburg, 22761 Hamburg, Germany
| | - J P Hill
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
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33
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Direct observation of dynamic charge stripes in La2-xSrxNiO4. Nat Commun 2014; 5:3467. [PMID: 24632780 DOI: 10.1038/ncomms4467] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Accepted: 02/18/2014] [Indexed: 11/08/2022] Open
Abstract
The insulator-to-metal transition continues to be a challenging subject, especially when electronic correlations are strong. In layered compounds, such as La2-xSrxNiO4 and La2-xBaxCuO4, the doped charge carriers can segregate into periodically spaced charge stripes separating narrow domains of antiferromagnetic order. Although there have been theoretical proposals of dynamically fluctuating stripes, direct spectroscopic evidence of charge-stripe fluctuations has been lacking. Here we report the detection of critical lattice fluctuations, driven by charge-stripe correlations, in La2-xSrxNiO4 using inelastic neutron scattering. This scattering is detected at large momentum transfers where the magnetic form factor suppresses the spin fluctuation signal. The lattice fluctuations associated with the dynamic charge stripes are narrow in q and broad in energy. They are strongest near the charge-stripe melting temperature. Our results open the way towards the quantitative theory of dynamic stripes and for directly detecting dynamical charge stripes in other strongly correlated systems, including high-temperature superconductors such as La2-xSrxCuO4.
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34
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Zhou SY, Langner MC, Zhu Y, Chuang YD, Rini M, Glover TE, Hertlein MP, Gonzalez AGC, Tahir N, Tomioka Y, Tokura Y, Hussain Z, Schoenlein RW. Glass-like recovery of antiferromagnetic spin ordering in a photo-excited manganite Pr₀.₇Ca₀.₃MnO₃. Sci Rep 2014; 4:4050. [PMID: 24522173 PMCID: PMC3923209 DOI: 10.1038/srep04050] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 01/16/2014] [Indexed: 11/09/2022] Open
Abstract
Electronic orderings of charges, orbitals and spins are observed in many strongly correlated electron materials, and revealing their dynamics is a critical step toward undertsanding the underlying physics of important emergent phenomena. Here we use time-resolved resonant soft x-ray scattering spectroscopy to probe the dynamics of antiferromagnetic spin ordering in the manganite Pr₀.₇Ca₀.₃MnO₃ following ultrafast photo-exitation. Our studies reveal a glass-like recovery of the spin ordering and a crossover in the dimensionality of the restoring interaction from quasi-1D at low pump fluence to 3D at high pump fluence. This behavior arises from the metastable state created by photo-excitation, a state characterized by spin disordered metallic droplets within the larger charge- and spin-ordered insulating domains. Comparison with time-resolved resistivity measurements suggests that the collapse of spin ordering is correlated with the insulator-to-metal transition, but the recovery of the insulating phase does not depend on the re-establishment of the spin ordering.
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Affiliation(s)
- S Y Zhou
- 1] Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA [2] State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China [3] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - M C Langner
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Y Zhu
- 1] Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA [2] Department of Applied Science, University of California, Davis, CA 95616, USA
| | - Y-D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - M Rini
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - T E Glover
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - M P Hertlein
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - A G Cruz Gonzalez
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - N Tahir
- 1] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA [2] National Center for Physics, Islamabad, Pakistan
| | - Y Tomioka
- Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 4, 1-1-1 Higashi Tsukuba 305-8562, Japan
| | - Y Tokura
- 1] Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan [2] Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), Advanced Science Institute, RIKEN, Wako 351-0198, Japan
| | - Z Hussain
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - R W Schoenlein
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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35
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de Jong S, Kukreja R, Trabant C, Pontius N, Chang CF, Kachel T, Beye M, Sorgenfrei F, Back CH, Bräuer B, Schlotter WF, Turner JJ, Krupin O, Doehler M, Zhu D, Hossain MA, Scherz AO, Fausti D, Novelli F, Esposito M, Lee WS, Chuang YD, Lu DH, Moore RG, Yi M, Trigo M, Kirchmann P, Pathey L, Golden MS, Buchholz M, Metcalf P, Parmigiani F, Wurth W, Föhlisch A, Schüßler-Langeheine C, Dürr HA. Speed limit of the insulator-metal transition in magnetite. NATURE MATERIALS 2013; 12:882-6. [PMID: 23892787 DOI: 10.1038/nmat3718] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 06/24/2013] [Indexed: 05/19/2023]
Abstract
As the oldest known magnetic material, magnetite (Fe3O4) has fascinated mankind for millennia. As the first oxide in which a relationship between electrical conductivity and fluctuating/localized electronic order was shown, magnetite represents a model system for understanding correlated oxides in general. Nevertheless, the exact mechanism of the insulator-metal, or Verwey, transition has long remained inaccessible. Recently, three-Fe-site lattice distortions called trimerons were identified as the characteristic building blocks of the low-temperature insulating electronically ordered phase. Here we investigate the Verwey transition with pump-probe X-ray diffraction and optical reflectivity techniques, and show how trimerons become mobile across the insulator-metal transition. We find this to be a two-step process. After an initial 300 fs destruction of individual trimerons, phase separation occurs on a 1.5±0.2 ps timescale to yield residual insulating and metallic regions. This work establishes the speed limit for switching in future oxide electronics.
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Affiliation(s)
- S de Jong
- 1] Stanford Institute for Energy and Materials Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA [2]
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36
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Moritz B, Kemper AF, Sentef M, Devereaux TP, Freericks JK. Electron-mediated relaxation following ultrafast pumping of strongly correlated materials: model evidence of a correlation-tuned crossover between thermal and nonthermal states. PHYSICAL REVIEW LETTERS 2013; 111:077401. [PMID: 23992080 DOI: 10.1103/physrevlett.111.077401] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Indexed: 06/02/2023]
Abstract
We examine electron-electron mediated relaxation following ultrafast electric field pump excitation of the fermionic degrees of freedom in the Falicov-Kimball model for correlated electrons. The results reveal a dichotomy in the temporal evolution of the system as one tunes through the Mott metal-to-insulator transition: in the metallic regime relaxation can be characterized by evolution toward a steady state well described by Fermi-Dirac statistics with an increased effective temperature; however, in the insulating regime this quasithermal paradigm breaks down with relaxation toward a nonthermal state with a complicated electronic distribution as a function of momentum. We characterize the behavior by studying changes in the energy, photoemission response, and electronic distribution as functions of time. This relaxation may be observable qualitatively on short enough time scales that the electrons behave like an isolated system not in contact with additional degrees of freedom which would act as a thermal bath, especially when using strong driving fields and studying materials whose physics may manifest the effects of correlations.
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Affiliation(s)
- B Moritz
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
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37
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Mertelj T, Kusar P, Kabanov VV, Giraldo-Gallo P, Fisher IR, Mihailovic D. Incoherent topological defect recombination dynamics in TbTe3. PHYSICAL REVIEW LETTERS 2013; 110:156401. [PMID: 25167288 DOI: 10.1103/physrevlett.110.156401] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 12/06/2012] [Indexed: 06/03/2023]
Abstract
We study the incoherent recombination of topological defects created during a rapid quench of a charge-density-wave system through the electronic ordering transition. Using a specially devised three-pulse femtosecond optical spectroscopy technique we follow the evolution of the order parameter over a wide range of time scales. By careful consideration of thermal processes we can clearly identify intrinsic topological defect annihilation processes on a time scale ∼30 ps and find a possible signature of extrinsic defect-dominated relaxation dynamics occurring on longer time scales.
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Affiliation(s)
- T Mertelj
- Complex Matter Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - P Kusar
- Complex Matter Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - V V Kabanov
- Complex Matter Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - P Giraldo-Gallo
- Department of Applied Physics, Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
| | - I R Fisher
- Department of Applied Physics, Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA and SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D Mihailovic
- Complex Matter Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia and CENN Nanocentre, Jamova 39, 1000 Ljubljana, Slovenia
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38
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Chuang YD, Lee WS, Kung YF, Sorini AP, Moritz B, Moore RG, Patthey L, Trigo M, Lu DH, Kirchmann PS, Yi M, Krupin O, Langner M, Zhu Y, Zhou SY, Reis DA, Huse N, Robinson JS, Kaindl RA, Schoenlein RW, Johnson SL, Först M, Doering D, Denes P, Schlotter WF, Turner JJ, Sasagawa T, Hussain Z, Shen ZX, Devereaux TP. Real-time manifestation of strongly coupled spin and charge order parameters in stripe-ordered La(1.75)Sr(0.25)NiO(4) nickelate crystals using time-resolved resonant x-ray diffraction. PHYSICAL REVIEW LETTERS 2013; 110:127404. [PMID: 25166848 DOI: 10.1103/physrevlett.110.127404] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Indexed: 05/19/2023]
Abstract
We investigate the order parameter dynamics of the stripe-ordered nickelate, La(1.75)Sr(0.25)NiO(4), using time-resolved resonant x-ray diffraction. In spite of distinct spin and charge energy scales, the two order parameters' amplitude dynamics are found to be linked together due to strong coupling. Additionally, the vector nature of the spin sector introduces a longer reorientation time scale which is absent in the charge sector. These findings demonstrate that the correlation linking the symmetry-broken states does not unbind during the nonequilibrium process, and the time scales are not necessarily associated with the characteristic energy scales of individual degrees of freedom.
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Affiliation(s)
- Y D Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - W S Lee
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
| | - Y F Kung
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
| | - A P Sorini
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA and Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Moritz
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA and Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA and Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
| | - R G Moore
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
| | - L Patthey
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA and Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - M Trigo
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA and SLAC National Accelerator Laboratory, Stanford PULSE Institute, Menlo Park, California 94025, USA
| | - D H Lu
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - P S Kirchmann
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
| | - M Yi
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
| | - O Krupin
- European XFEL GmbH, 22607 Hamburg, Germany and Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - M Langner
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Y Zhu
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - S Y Zhou
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - D A Reis
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA and SLAC National Accelerator Laboratory, Stanford PULSE Institute, Menlo Park, California 94025, USA
| | - N Huse
- Max-Planck Department for Structural Dynamics, Center for Free Electron Laser Science, University of Hamburg, 22761 Hamburg, Germany
| | - J S Robinson
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - R A Kaindl
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R W Schoenlein
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - S L Johnson
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland
| | - M Först
- Max-Planck Department for Structural Dynamics, Center for Free Electron Laser Science, University of Hamburg, 22761 Hamburg, Germany
| | - D Doering
- Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - P Denes
- Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - T Sasagawa
- Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
| | - Z Hussain
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Z X Shen
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
| | - T P Devereaux
- SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, USA
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Coslovich G, Huber B, Lee WS, Chuang YD, Zhu Y, Sasagawa T, Hussain Z, Bechtel HA, Martin MC, Schoenlein RW, Shen ZX, Kaindl RA. Ultrafast Mid-infrared Spectroscopy of the Charge- and Spin-Ordered Nickelate La 1.75Sr 0.25NiO 4. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134103016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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40
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Coslovich G, Huber B, Lee WS, Chuang YD, Zhu Y, Sasagawa T, Hussain Z, Bechtel HA, Martin MC, Shen ZX, Schoenlein RW, Kaindl RA. Ultrafast charge localization in a stripe-phase nickelate. Nat Commun 2013; 4:2643. [PMID: 24153394 PMCID: PMC3826635 DOI: 10.1038/ncomms3643] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 09/19/2013] [Indexed: 11/08/2022] Open
Abstract
Self-organized electronically ordered phases are a recurring feature in correlated materials, resulting in, for example, fluctuating charge stripes whose role in high-TC superconductivity is under debate. However, the relevant cause-effect relations between real-space charge correlations and low-energy excitations remain hidden in time-averaged studies. Here we reveal ultrafast charge localization and lattice vibrational coupling as dynamic precursors of stripe formation in the model compound La(1.75)Sr(0.25)NiO4, using ultrafast and equilibrium mid-infrared spectroscopy. The opening of a pseudogap at a crossover temperature T* far above long-range stripe formation establishes the onset of electronic localization, which is accompanied by an enhanced Fano asymmetry of Ni-O stretch vibrations. Ultrafast excitation triggers a sub-picosecond dynamics exposing the synchronous modulation of electron-phonon coupling and charge localization. These results illuminate the role of localization in forming the pseudogap in nickelates, opening a path to understanding this mysterious phase in a broad class of complex oxides.
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Affiliation(s)
- G. Coslovich
- Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - B. Huber
- Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - W. -S. Lee
- SIMES, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Y. -D. Chuang
- Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - Y. Zhu
- Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - T. Sasagawa
- Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
| | - Z. Hussain
- Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - H. A. Bechtel
- Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - M. C. Martin
- Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - Z. -X. Shen
- SIMES, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - R. W. Schoenlein
- Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - R. A. Kaindl
- Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
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