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Takami T, Takeuchi T, Fukunaga T. Spin polarization in the phase diagram of a Li-Fe-S system. Sci Rep 2019; 9:19947. [PMID: 31882639 PMCID: PMC6934561 DOI: 10.1038/s41598-019-56244-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 12/09/2019] [Indexed: 11/23/2022] Open
Abstract
Divalent and trivalent states of Fe ions are known to be stable in inorganic compounds. We focus a novel LixFeS5 cathode, in which the Li content (x) changes from 2 to 10 by an electrochemical technique. As x increases from 2, a Pauli paramagnetic conductive Li2FeS5 phase changes into a superparamagnetic insulating Li10FeS5 phase. Density functional theory calculations suggest that Fe+ ions in a high-x phase are responsible for ferromagnetic spin polarization. Reaching the monovalent Fe ion is significant for understanding microscopic chemistry behind operation as Li-ion batteries and the original physical properties resulting from the unique local structure.
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Affiliation(s)
- Tsuyoshi Takami
- Office of Society-Academia Collaboration for Innovation, Center for Advanced Science Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
| | - Tomonari Takeuchi
- Research Institute of Electrochemical Energy (RIECEN), National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan
| | - Toshiharu Fukunaga
- Office of Society-Academia Collaboration for Innovation, Center for Advanced Science Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
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Leedahl B, Sundermann M, Amorese A, Severing A, Gretarsson H, Zhang L, Komarek AC, Maignan A, Haverkort MW, Tjeng LH. Origin of Ising magnetism in Ca 3Co 2O 6 unveiled by orbital imaging. Nat Commun 2019; 10:5447. [PMID: 31784516 PMCID: PMC6884600 DOI: 10.1038/s41467-019-13273-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/24/2019] [Indexed: 11/22/2022] Open
Abstract
The one-dimensional cobaltate Ca\documentclass[12pt]{minimal}
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\begin{document}$${}_{3}$$\end{document}3Co\documentclass[12pt]{minimal}
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\begin{document}$${}_{2}$$\end{document}2O\documentclass[12pt]{minimal}
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\begin{document}$${}_{6}$$\end{document}6 is an intriguing material having an unconventional magnetic structure, displaying quantum tunneling phenomena in its magnetization. Using a newly developed experimental method, \documentclass[12pt]{minimal}
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\begin{document}$$s$$\end{document}s-core-level non-resonant inelastic x-ray scattering (\documentclass[12pt]{minimal}
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\begin{document}$$s$$\end{document}s-NIXS), we were able to image the atomic Co \documentclass[12pt]{minimal}
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\begin{document}$$3d$$\end{document}3d orbital that is responsible for the Ising magnetism in this system. We can directly observe that corrections to the commonly accepted ideal prismatic trigonal crystal field scheme occur in Ca\documentclass[12pt]{minimal}
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\begin{document}$${}_{3}$$\end{document}3Co\documentclass[12pt]{minimal}
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\begin{document}$${}_{6}$$\end{document}6, and it is the complex \documentclass[12pt]{minimal}
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\begin{document}$${d}_{2}$$\end{document}d2 orbital occupied by the sixth electron at the high-spin Co\documentclass[12pt]{minimal}
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\begin{document}$${}_{\,\text{trig}\,}^{3+}$$\end{document}trig3+ (\documentclass[12pt]{minimal}
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\begin{document}$${d}^{6}$$\end{document}d6) sites that generates the Ising-like behavior. The ability to directly relate the orbital occupation with the local crystal structure is essential to model the magnetic properties of this system. Ca\documentclass[12pt]{minimal}
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\begin{document}$${}_{3}$$\end{document}3Co\documentclass[12pt]{minimal}
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\begin{document}$${}_{6}$$\end{document}6 has an unconventional magnetic structure displaying quantum tunnelling phenomena in its magnetization. Here, the authors use s-core-level non-resonant inelastic X-ray scattering to image the atomic Co 3d orbital that is responsible for the Ising magnetism in this system.
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Affiliation(s)
- Brett Leedahl
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Martin Sundermann
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany
| | - Andrea Amorese
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany
| | - Andrea Severing
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany
| | - Hlynur Gretarsson
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.,PETRA III, Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607, Hamburg, Germany
| | - Lunyong Zhang
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Alexander C Komarek
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Antoine Maignan
- Laboratoire CRISMAT, UMR 6508 CNRS-ENSICAEN, 6 bd Maréchal Juin, 14050, Caen Cedex, France
| | - Maurits W Haverkort
- Institute for Theoretical Physics, Heidelberg University, Philosophenweg 19, 69120, Heidelberg, Germany
| | - Liu Hao Tjeng
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.
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Sugiyama J, Nozaki H, Harada M, Higuchi Y, Sakurai H, Ansaldo EJ, Brewer JH, Keller L, Pomjakushin V, Månsson M. Magnetic Ground State of Novel Zigzag Chain Compounds, NaCr2O4 and Ca1-xNaxCr2O4, Determined with Muons and Neutrons. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.phpro.2015.12.112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Månsson M, Umegaki I, Nozaki H, Higuchi Y, Kawasaki I, Watanabe I, Sakurai H, Sugiyama J. Na-ion dynamics in Quasi-1D compound NaV2O4. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/551/1/012035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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