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Kumar N, Rom T, Mallick B, Kaushik R, Ghosh A, Babu PD, Panda S, Paul AK. Antiferromagnetically Coupled Double Perovskite as an Efficient and Robust Catalyst for Visible Light Driven Water Splitting at Neutral pH. Phys Chem Chem Phys 2022; 24:5083-5093. [DOI: 10.1039/d1cp04082k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Green and sustainable energy production through renewable sources is enormously an exciting field of research. Herein, we report A-site lanthanum doped oxygen excess ruthenate (predominantly Ru5+-ions) double perovskite system, CaLaScRuO6+δ...
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Okuma R, Kofu M, Asai S, Avdeev M, Koda A, Okabe H, Hiraishi M, Takeshita S, Kojima KM, Kadono R, Masuda T, Nakajima K, Hiroi Z. Dimensional reduction by geometrical frustration in a cubic antiferromagnet composed of tetrahedral clusters. Nat Commun 2021; 12:4382. [PMID: 34282147 PMCID: PMC8289872 DOI: 10.1038/s41467-021-24636-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 06/28/2021] [Indexed: 11/09/2022] Open
Abstract
Dimensionality is a critical factor in determining the properties of solids and is an apparent built-in character of the crystal structure. However, it can be an emergent and tunable property in geometrically frustrated spin systems. Here, we study the spin dynamics of the tetrahedral cluster antiferromagnet, pharmacosiderite, via muon spin resonance and neutron scattering. We find that the spin correlation exhibits a two-dimensional characteristic despite the isotropic connectivity of tetrahedral clusters made of spin 5/2 Fe3+ ions in the three-dimensional cubic crystal, which we ascribe to two-dimensionalisation by geometrical frustration based on spin wave calculations. Moreover, we suggest that even one-dimensionalisation occurs in the decoupled layers, generating low-energy and one-dimensional excitation modes, causing large spin fluctuation in the classical spin system. Pharmacosiderite facilitates studying the emergence of low-dimensionality and manipulating anisotropic responses arising from the dimensionality using an external magnetic field.
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Affiliation(s)
- Ryutaro Okuma
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan.
- Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, Japan.
- Clarendon Laboratory, University of Oxford, Parks Road, Oxford, UK.
| | - Maiko Kofu
- Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
| | - Shinichiro Asai
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan
| | - Maxim Avdeev
- Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, Australia
- School of Chemistry, The University of Sydney, Sydney, Australia
| | - Akihiro Koda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki, Japan
| | - Hirotaka Okabe
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki, Japan
| | - Masatoshi Hiraishi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki, Japan
| | - Soshi Takeshita
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki, Japan
| | - Kenji M Kojima
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki, Japan
- Center for Molecular and Materials Science, TRIUMF, Vancouver, BC, Canada
| | - Ryosuke Kadono
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), Tsukuba, Ibaraki, Japan
| | - Takatsugu Masuda
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan
| | - Kenji Nakajima
- Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, Japan
| | - Zenji Hiroi
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan
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Fang YW, Yang R, Chen H. The complex non-collinear magnetic orderings in Ba 2YOsO 6: a new approach to tuning spin-lattice interactions and controlling magnetic orderings in frustrated complex oxides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:445803. [PMID: 31300630 DOI: 10.1088/1361-648x/ab31e0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Frustrated magnets are one class of fascinating materials that host many intriguing phases such as spin ice, spin liquid and complex long-range magnetic orderings at low temperatures. In this work we use first-principles calculations to find that in a wide range of magnetically frustrated oxides, at zero temperature a number of non-collinear magnetic orderings are more stable than the type-I collinear ordering that is observed at finite temperatures. The emergence of non-collinear orderings in those complex oxides is due to higher-order exchange interactions that originate from second-row and third-row transition metal elements. This implies a collinear-to-noncollinear spin transition at sufficiently low temperatures in those frustrated complex oxides. Furthermore, we find that in a particular oxide Ba2YOsO6, experimentally feasible uniaxial strain can tune the material between two different non-collinear magnetic orderings. Our work predicts new non-collinear magnetic orderings in frustrated complex oxides at very low temperatures and provides a mechanical route to tuning complex non-collinear magnetic orderings in those materials.
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Affiliation(s)
- Yue-Wen Fang
- Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan. NYU-ECNU Institute of Physics, New York University, Shanghai, People's Republic of China
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Ou X, Fan F, Chen X, Li T, Jiang L, Stroppa A, Ouyang X, Wu H. Magnetic frustration in double perovskite LaSrNiRuO
6. ACTA ACUST UNITED AC 2018. [DOI: 10.1209/0295-5075/123/57003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Injac S, Kayser P, Avdeev M, Kennedy BJ. Structural and magnetic studies of the ruthenium perovskites Ba2-xSrxHoRuO6. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.04.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kayser P, Injac S, Ranjbar B, Kennedy BJ, Avdeev M, Yamaura K. Magnetic and Structural Studies of Sc Containing Ruthenate Double Perovskites A2ScRuO6 (A = Ba, Sr). Inorg Chem 2017; 56:9009-9018. [DOI: 10.1021/acs.inorgchem.7b00983] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paula Kayser
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Sean Injac
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Ben Ranjbar
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Brendan J. Kennedy
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Maxim Avdeev
- Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2234, Australia
| | - Kazunari Yamaura
- Research Center for Functional Material, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, North 10 West 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
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The impact of chemical doping on the magnetic state of the Sr 2 YRuO 6 double perovskite. J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2017.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Abstract
The antiferromagnetic Ising model is investigated on the twenty 2-uniform lattices using the Monte Carlo method based on the Wang-Landau algorithm and the Metropolis algorithm to study the geometric frustration effect systematically. Based on the specific heat, the residual entropy, and the Edwards-Anderson freezing order parameter, the ground states of them were determined. In addition to the long-range-ordered phase and the spin ice phase found in the Archimedean lattices, two more phases were found. The partial long-range order is long-range order with exceptional disordered sites, which give extensive residual entropy. In the partial spin ice phase, the partial freezing phenomenon appears: A majority of sites are frozen without long-range order, but the other sites are fluctuating even at zero temperature. The spin liquid ground state was not found in the 2-uniform lattices.
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Affiliation(s)
- Unjong Yu
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
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Javanparast B, Hao Z, Enjalran M, Gingras MJP. Fluctuation-driven selection at criticality in a frustrated magnetic system: the case of multiple-k partial order on the pyrochlore lattice. PHYSICAL REVIEW LETTERS 2015; 114:130601. [PMID: 25884120 DOI: 10.1103/physrevlett.114.130601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Indexed: 06/04/2023]
Abstract
We study the problem of partially ordered phases with periodically arranged disordered (paramagnetic) sites on the pyrochlore lattice, a network of corner-sharing tetrahedra. The periodicity of these phases is characterized by one or more wave vectors k={1/21/21/2}. Starting from a general microscopic Hamiltonian including anisotropic nearest-neighbor exchange, long-range dipolar interactions, and second- and third-nearest neighbor exchange, we use standard mean-field theory (SMFT) to identify an extended range of interaction parameters that support partially ordered phases. We demonstrate that thermal fluctuations ignored in SMFT are responsible for the selection of one particular partially ordered phase, e.g., the "4-k" phase over the "1-k" phase. We suggest that the transition into the 4-k phase is continuous with its critical properties controlled by the cubic fixed point of a Ginzburg-Landau theory with a four-component vector order parameter. By combining an extension of the Thouless-Anderson-Palmer method originally used to study fluctuations in spin glasses with parallel-tempering Monte Carlo simulations, we establish the phase diagram for different types of partially ordered phases. Our results elucidate the long-standing puzzle concerning the origin of the 4-k partially ordered phase observed in the Gd2Ti2O7 dipolar pyrochlore antiferromagnet below its paramagnetic phase transition temperature.
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Affiliation(s)
- Behnam Javanparast
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Zhihao Hao
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Matthew Enjalran
- Physics Department, Southern Connecticut State University, 501 Crescent Street, New Haven, Connecticut 06515-1355, USA
| | - Michel J P Gingras
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- Canadian Institute for Advanced Research, 180 Dundas Street West, Toronto, Ontario M5G 1Z8, Canada
- Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario N2L 2Y5, Canada
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Sarapulova A, Adler P, Schnelle W, Mikhailova D, Felser C, Tjeng LH, Jansen M. Sr2MgOsO6: A Frustrated Os6+(5d2) Double Perovskite with Strong Antiferromagnetic Interactions. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500151] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Paul AK, Sarapulova A, Adler P, Reehuis M, Kanungo S, Mikhailova D, Schnelle W, Hu Z, Kuo C, Siruguri V, Rayaprol S, Soo Y, Yan B, Felser C, Hao Tjeng L, Jansen M. Magnetically Frustrated Double Perovskites: Synthesis, Structural Properties, and Magnetic Order of Sr2BOsO6(B= Y, In, Sc). Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201400590] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ranjbar B, Pavan A, Kennedy BJ, Zhang Z. Structural and magnetic properties of the ruthenium double perovskites Ba2−xSrxYRuO6. Dalton Trans 2015; 44:10689-99. [DOI: 10.1039/c4dt03682d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Doping Ba2YRuO6 with Sr induces octahedral tilting and significantly impacts on the magnetic properties.
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Affiliation(s)
- Ben Ranjbar
- School of Chemistry
- The University of Sydney
- Sydney
- Australia
| | - Adriano Pavan
- School of Chemistry
- The University of Sydney
- Sydney
- Australia
| | | | - Zhaoming Zhang
- Australian Nuclear Science and Technology Organisation
- NSW 2234
- Australia
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Bernardo P, Ghivelder L, Eslava G, Amorim H, Felner I, Garcia S. Monoclinic distortion and magnetic coupling in the double perovskite Sr 2−x Ca x YRuO 6. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.09.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Langridge S, Watson GM, Gibbs D, Betouras JJ, Gidopoulos NI, Pollmann F, Long MW, Vettier C, Lander GH. Distinct magnetic phase transition at the surface of an antiferromagnet. PHYSICAL REVIEW LETTERS 2014; 112:167201. [PMID: 24815664 DOI: 10.1103/physrevlett.112.167201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Indexed: 06/03/2023]
Abstract
In the majority of magnetic systems the surface is required to order at the same temperature as the bulk. In the present Letter, we report a distinct and unexpected surface magnetic phase transition at a lower temperature than the Néel temperature. Employing grazing incidence x-ray resonant magnetic scattering, we have observed the near-surface behavior of uranium dioxide. UO2 is a noncollinear, triple-q, antiferromagnet with the U ions on a face-centered cubic lattice. Theoretical investigations establish that at the surface the energy increase-due to the lost bonds-is reduced when the spins near the surface rotate, gradually losing their component normal to the surface. At the surface the lowest-energy spin configuration has a double-q (planar) structure. With increasing temperature, thermal fluctuations saturate the in-plane crystal field anisotropy at the surface, leading to soft excitations that have ferromagnetic XY character and are decoupled from the bulk. The structure factor of a finite two-dimensional XY model fits the experimental data well for several orders of magnitude of the scattered intensity. Our results support a distinct magnetic transition at the surface in the Kosterlitz-Thouless universality class.
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Affiliation(s)
- S Langridge
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxon OX11 0QX, United Kingdom
| | - G M Watson
- Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - D Gibbs
- Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - J J Betouras
- Department of Physics, University of Loughborough, Loughborough LE11 3TU, United Kingdom
| | - N I Gidopoulos
- Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - F Pollmann
- Max Planck Institute for Physics of Complex Systems, Noethnitzer Strasse 38, 01187 Dresden, Germany
| | - M W Long
- School of Physics, Birmingham University, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - C Vettier
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
| | - G H Lander
- European Commission, Joint Research Center, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe, Germany
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Aczel AA, Baker PJ, Bugaris DE, Yeon J, Zur Loye HC, Guidi T, Adroja DT. Exotic magnetism on the quasi-fcc lattices of the d3 double Perovskites La2NaB'O6 (B'=Ru, Os). PHYSICAL REVIEW LETTERS 2014; 112:117603. [PMID: 24702418 DOI: 10.1103/physrevlett.112.117603] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Indexed: 06/03/2023]
Abstract
We find evidence for long-range and short-range (ζ=70 Å at 4 K) incommensurate magnetic order on the quasi-face-centered-cubic (fcc) lattices of the monoclinic double perovskites La2NaRuO6 and La2NaOsO6, respectively. Incommensurate magnetic order on the fcc lattice has not been predicted by mean field theory, but may arise via a delicate balance of inequivalent nearest neighbor and next nearest neighbor exchange interactions. In the Ru system with long-range order, inelastic neutron scattering also reveals a spin gap Δ ∼ 2.75 meV. Magnetic anisotropy is generally minimized in the more familiar octahedrally coordinated 3d3 systems, so the large gap observed for La2NaRuO6 may result from the significantly enhanced value of spin-orbit coupling in this 4d(3) material.
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Affiliation(s)
- A A Aczel
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P J Baker
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0QX, United Kingdom
| | - D E Bugaris
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - J Yeon
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - H-C Zur Loye
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - T Guidi
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0QX, United Kingdom
| | - D T Adroja
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0QX, United Kingdom and Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
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Paddison JAM, Stewart JR, Goodwin AL. SPINVERT: a program for refinement of paramagnetic diffuse scattering data. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:454220. [PMID: 24140881 DOI: 10.1088/0953-8984/25/45/454220] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We present a program (spinvert; http://spinvert.chem.ox.ac.uk) for refinement of magnetic diffuse scattering data for frustrated magnets, spin liquids, spin glasses, and other magnetically disordered materials. The approach uses reverse Monte Carlo refinement to fit a large configuration of spins to experimental powder neutron diffraction data. Despite fitting to spherically averaged data, this approach allows the recovery of the three-dimensional magnetic diffuse scattering pattern and the spin-pair correlation function. We illustrate the use of the spinvert program with two case studies. First, we use simulated powder data for the canonical antiferromagnetic Heisenberg model on the kagome lattice to discuss the sensitivity of spinvert refinement to both pairwise and higher-order spin correlations. The effect of limited experimental data on the results is also considered. Second, we re-analyse published experimental data on the frustrated system Y0.5Ca0.5BaCo4O7. The results from spinvert refinement indicate similarities between Y0.5Ca0.5BaCo4O7 and its parent compound YBaCo4O7, which were overlooked in previous analyses using powder data.
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Affiliation(s)
- Joseph A M Paddison
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, UK. ISIS Facility, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, UK
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Paul AK, Reehuis M, Ksenofontov V, Yan B, Hoser A, Többens DM, Abdala PM, Adler P, Jansen M, Felser C. Lattice instability and competing spin structures in the double perovskite insulator Sr2FeOsO6. PHYSICAL REVIEW LETTERS 2013; 111:167205. [PMID: 24182298 DOI: 10.1103/physrevlett.111.167205] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Indexed: 06/02/2023]
Abstract
The semiconductor Sr2FeOsO6, depending on temperature, adopts two types of spin structures that differ in the spin sequence of ferrimagnetic iron-osmium layers along the tetragonal c axis. Neutron powder diffraction experiments, 57Fe Mössbauer spectra, and density functional theory calculations suggest that this behavior arises because a lattice instability resulting in alternating iron-osmium distances fine-tunes the balance of competing exchange interactions. Thus, Sr2FeOsO6 is an example of a double perovskite, in which the electronic phases are controlled by the interplay of spin, orbital, and lattice degrees of freedom.
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Affiliation(s)
- Avijit Kumar Paul
- Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany and Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
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