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Katukuri VM, Babkevich P, Mustonen O, Walker HC, Fåk B, Vasala S, Karppinen M, Rønnow HM, Yazyev OV. Exchange Interactions Mediated by Nonmagnetic Cations in Double Perovskites. Phys Rev Lett 2020; 124:077202. [PMID: 32142335 DOI: 10.1103/physrevlett.124.077202] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 10/21/2019] [Accepted: 01/28/2020] [Indexed: 06/10/2023]
Abstract
Establishing the physical mechanism governing exchange interactions is fundamental for exploring exotic phases such as quantum spin liquids in real materials. In this Letter, we address exchange interactions in Sr_{2}CuTe_{x}W_{1-x}O_{6}, a series of double perovskites that realize a spin-1/2 square lattice and are suggested to harbor a quantum spin liquid ground state arising from the random distribution of nonmagnetic ions. Our ab initio multireference configuration interaction calculations show that replacing Te atoms with W atoms changes the dominant couplings from nearest to next-nearest neighbor due to the crucial role of unoccupied states of the nonmagnetic ions in the super-superexchange mechanism. Combined with spin-wave theory simulations, our calculated exchange couplings provide an excellent description of the inelastic neutron scattering spectra of the parent compounds, as well as explaining that the magnetic excitations in Sr_{2}CuTe_{0.5}W_{0.5}O_{6} emerge from bond-disordered exchange couplings. Our results demonstrate the crucial role of the nonmagnetic cations in exchange interactions paving the way to further explore quantum spin liquid phases in bond-disordered materials.
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Affiliation(s)
- Vamshi M Katukuri
- Chair of Computational Condensed Matter Physics, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - P Babkevich
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - O Mustonen
- Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland
- Department of Material Science and Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
| | - H C Walker
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 OQX, United Kingdom
| | - B Fåk
- Institut Laue-Langevin, CS 20156, F-38042 Grenoble Cedex 9, France
| | - S Vasala
- Institut für Materialwissenschaft, Fachgebiet Materialdesign durch Synthese, Technische Universitüt Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - M Karppinen
- Department of Chemistry and Materials Science, Aalto University, FI-00076 Espoo, Finland
| | - H M Rønnow
- Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - O V Yazyev
- Chair of Computational Condensed Matter Physics, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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Li L, Craze AR, Mustonen O, Zenno H, Whittaker JJ, Hayami S, Lindoy LF, Marjo CE, Clegg JK, Aldrich-Wright JR, Li F. A mixed-spin spin-crossover thiozolylimine [Fe4L6]8+ cage. Dalton Trans 2019; 48:9935-9938. [DOI: 10.1039/c9dt01947b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mixed-spin spin-crossover thiozolylimine [Fe4L6]8+ tetrahedral cage is reported.
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Affiliation(s)
- Li Li
- School of Science and Health
- Western Sydney University
- Penrith
- Australia
| | | | - Outi Mustonen
- Mark Wainwright Analytical Centre
- University of New South Wales
- Kensington
- Australia
| | - Hikaru Zenno
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Chuo-ku
- Japan
| | - Jacob J. Whittaker
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane St Lucia
- Australia
| | - Shinya Hayami
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Chuo-ku
- Japan
| | | | - Christopher E. Marjo
- Mark Wainwright Analytical Centre
- University of New South Wales
- Kensington
- Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane St Lucia
- Australia
| | | | - Feng Li
- School of Science and Health
- Western Sydney University
- Penrith
- Australia
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Craze AR, Howard-Smith KJ, Bhadbhade MM, Mustonen O, Kepert CJ, Marjo CE, Li F. Investigation of the High-Temperature Spin-Transition of a Mononuclear Iron(II) Complex Using X-ray Photoelectron Spectroscopy. Inorg Chem 2018; 57:6503-6510. [DOI: 10.1021/acs.inorgchem.8b00576] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Alexander R. Craze
- School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia
| | - Kyle J. Howard-Smith
- School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia
| | - Mohan M. Bhadbhade
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Outi Mustonen
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Cameron J. Kepert
- School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Christopher E. Marjo
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Feng Li
- School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia
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Mustonen O, Vasala S, Sadrollahi E, Schmidt KP, Baines C, Walker HC, Terasaki I, Litterst FJ, Baggio-Saitovitch E, Karppinen M. Spin-liquid-like state in a spin-1/2 square-lattice antiferromagnet perovskite induced by d 10-d 0 cation mixing. Nat Commun 2018. [PMID: 29540711 PMCID: PMC5852160 DOI: 10.1038/s41467-018-03435-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
A quantum spin liquid state has long been predicted to arise in spin-1/2 Heisenberg square-lattice antiferromagnets at the boundary region between Néel (nearest-neighbor interaction dominates) and columnar (next-nearest-neighbor interaction dominates) antiferromagnetic order. However, there are no known compounds in this region. Here we use d10-d0 cation mixing to tune the magnetic interactions on the square lattice while simultaneously introducing disorder. We find spin-liquid-like behavior in the double perovskite Sr2Cu(Te0.5W0.5)O6, where the isostructural end phases Sr2CuTeO6 and Sr2CuWO6 are Néel and columnar type antiferromagnets, respectively. We show that magnetism in Sr2Cu(Te0.5W0.5)O6 is entirely dynamic down to 19 mK. Additionally, we observe at low temperatures for Sr2Cu(Te0.5W0.5)O6-similar to several spin liquid candidates-a plateau in muon spin relaxation rate and a strong T-linear dependence in specific heat. Our observations for Sr2Cu(Te0.5W0.5)O6 highlight the role of disorder in addition to magnetic frustration in spin liquid physics.
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Affiliation(s)
- O Mustonen
- Department of Chemistry and Materials Science, Aalto University, FI-00076, Espoo, Finland
| | - S Vasala
- Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil
| | - E Sadrollahi
- Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38110, Braunschweig, Germany
| | - K P Schmidt
- Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38110, Braunschweig, Germany
| | - C Baines
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - H C Walker
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
| | - I Terasaki
- Department of Physics, Nagoya University, Nagoya, 464-8602, Japan
| | - F J Litterst
- Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil.,Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, 38110, Braunschweig, Germany
| | - E Baggio-Saitovitch
- Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Dr Xavier Sigaud 150, Urca, Rio de Janeiro, 22290-180, Brazil
| | - M Karppinen
- Department of Chemistry and Materials Science, Aalto University, FI-00076, Espoo, Finland.
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Li L, Craze AR, Akiyoshi R, Tsukiashi A, Hayami S, Mustonen O, Bhadbhade MM, Bhattacharyya S, Marjo CE, Wang Y, Lindoy LF, Aldrich-Wright JR, Li F. Direct monitoring of spin transitions in a dinuclear triple-stranded helicate iron(ii) complex through X-ray photoelectron spectroscopy. Dalton Trans 2018; 47:2543-2548. [DOI: 10.1039/c7dt04190j] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
VT-XPS shows that the spin behaviour is reversible between the HS and LS states in a new dinuclear helicate iron(ii) complex.
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Affiliation(s)
- Li Li
- School of Science and Health
- Western Sydney University
- Penrith
- Australia
| | | | - Ryohei Akiyoshi
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Japan
| | - Asami Tsukiashi
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Japan
| | - Shinya Hayami
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Japan
| | - Outi Mustonen
- Mark Wainwright Analytical Centre
- University of New South Wales
- Kensington
- Australia
| | - Mohan M. Bhadbhade
- Mark Wainwright Analytical Centre
- University of New South Wales
- Kensington
- Australia
| | - Saroj Bhattacharyya
- Mark Wainwright Analytical Centre
- University of New South Wales
- Kensington
- Australia
| | - Christopher E. Marjo
- Mark Wainwright Analytical Centre
- University of New South Wales
- Kensington
- Australia
| | - Yun Wang
- Centre for Clean Environment and Energy
- Gold Coast Campus
- Griffith University
- Australia
| | | | | | - Feng Li
- School of Science and Health
- Western Sydney University
- Penrith
- Australia
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Li L, Neville SM, Craze AR, Clegg JK, Sciortino NF, Arachchige KSA, Mustonen O, Marjo CE, McRae CR, Kepert CJ, Lindoy LF, Aldrich-Wright JR, Li F. Spin-State Patterning in an Iron(II) Tripodal Spin-Crossover Complex. ACS Omega 2017; 2:3349-3353. [PMID: 31457658 PMCID: PMC6641455 DOI: 10.1021/acsomega.7b00630] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 06/23/2017] [Indexed: 06/10/2023]
Abstract
A mononuclear iron(II) complex that displays a gradual two-step spin-crossover (SCO) transition is reported. The intermediate plateau (IP) occurs between HS0.40LS0.60 and HS0.30LS0.70 (HS = high spin; LS = low spin) ratios over the region of ca. 190-170 K. A phase change occurs at the IP, breaking the symmetry, resulting in six independent SCO sites compared to one at the 100% HS and LS plateau regions, respectively. Variable-temperature X-ray photoelectron spectroscopy shows that the SCO behavior is completely reversible among the HS, IP, and LS regions. The results both confirm and extend the related results for the above system described by Halcrow et al. (Kulmaczewski R.; Cespedes O.; Halcrow M. A.Gradual Thermal Spin-Crossover Mediated By a Reentrant Z' = 1 → Z' = 6 → Z' = 1 Phase Transition, Inorg. Chem. 2017, 56, 3144-3148) in a recent report.
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Affiliation(s)
- Li Li
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
| | | | - Alexander R. Craze
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
| | - Jack K. Clegg
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | | | | | - Outi Mustonen
- Mark
Wainwright Analytical Centre, University
of New South Wales, Sydney, NSW 2052, Australia
| | - Christopher E. Marjo
- Mark
Wainwright Analytical Centre, University
of New South Wales, Sydney, NSW 2052, Australia
| | - Christopher R. McRae
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Cameron J. Kepert
- School
of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Leonard F. Lindoy
- School
of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Janice R. Aldrich-Wright
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
| | - Feng Li
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
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Chou TL, Mustonen O, Tripathi TS, Karppinen M. Isovalent Ca and Ba substitutions in thermoelectric layer-structured oxyselenide Sr2CoO2Cu2Se2. J Phys Condens Matter 2016; 28:035802. [PMID: 26702873 DOI: 10.1088/0953-8984/28/3/035802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Multilayered compounds typically present exotic functionalities, and some of them have been suggested as potential materials for thermoelectric conversion owing to their unique capability to decouple electronic and heat transport. Here we report new [CoO2] and [Cu2Se2] layered A2CoO2Cu2Se2 compounds in which Sr at the intervening alkaline-earth A site is partially replaced with Ca or Ba. The parent Sr2CoO2Cu2Se2 phase is a direct gap p-type semiconductor, and density functional theory (DFT) calculations indicate its topmost valence band consists of Cu 3d-Se 4p states. Upon the isovalent cation substitution the lattice modification in the ab plane is constrained by the stiff [CoO2] layer such that the lattice shrinkage/expansion mainly happens along the c axis. Substitution of Sr with the heavier and larger Ba significantly enhances the thermopower but more hole states would be required to optimize the thermoelectric performance. Thermal stability is related to the inter-oxide-selenide-layer interaction, and our thermogravimetric measurement data reveal that the A2CoO2Cu2Se2 materials could operate in the intermediate temperature region.
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Affiliation(s)
- T L Chou
- Department of Chemistry, Aalto University, FI-00076 Aalto, Finland
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