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Suzuki H, Gretarsson H, Ishikawa H, Ueda K, Yang Z, Liu H, Kim H, Kukusta D, Yaresko A, Minola M, Sears JA, Francoual S, Wille HC, Nuss J, Takagi H, Kim BJ, Khaliullin G, Yavaş H, Keimer B. Spin waves and spin-state transitions in a ruthenate high-temperature antiferromagnet. NATURE MATERIALS 2019; 18:563-567. [PMID: 30911120 DOI: 10.1038/s41563-019-0327-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Ruthenium compounds serve as a platform for fundamental concepts such as spin-triplet superconductivity1, Kitaev spin liquids2-5 and solid-state analogues of the Higgs mode in particle physics6,7. However, basic questions about the electronic structure of ruthenates remain unanswered, because several key parameters (including Hund's coupling, spin-orbit coupling and exchange interactions) are comparable in magnitude and their interplay is poorly understood, partly due to difficulties in synthesizing large single crystals for spectroscopic experiments. Here we introduce a resonant inelastic X-ray scattering (RIXS)8,9 technique capable of probing collective modes in microcrystals of 4d electron materials. We observe spin waves and spin-state transitions in the honeycomb antiferromagnet SrRu2O6 (ref. 10) and use the extracted exchange interactions and measured magnon gap to explain its high Néel temperature11-16. We expect that the RIXS method presented here will enable momentum-resolved spectroscopy of a large class of 4d transition-metal compounds.
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Affiliation(s)
- H Suzuki
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany.
| | - H Gretarsson
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - H Ishikawa
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
- Institut für Funktionelle Materie und Quantentechnologien, Universität Stuttgart, Stuttgart, Germany
| | - K Ueda
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
- Department of Applied Physics, University of Tokyo, Tokyo, Japan
| | - Z Yang
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - H Liu
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - H Kim
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
- Department of Physics, Pohang University of Science and Technology, Pohang, South Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, South Korea
| | - D Kukusta
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - A Yaresko
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - M Minola
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - J A Sears
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - S Francoual
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - H-C Wille
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - J Nuss
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - H Takagi
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
- Institut für Funktionelle Materie und Quantentechnologien, Universität Stuttgart, Stuttgart, Germany
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - B J Kim
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
- Department of Physics, Pohang University of Science and Technology, Pohang, South Korea
- Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, South Korea
| | - G Khaliullin
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
| | - H Yavaş
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - B Keimer
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany.
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