• Open Access

Nonmagnetic J=0 State and Spin-Orbit Excitations in K2RuCl6

H. Takahashi, H. Suzuki, J. Bertinshaw, S. Bette, C. Mühle, J. Nuss, R. Dinnebier, A. Yaresko, G. Khaliullin, H. Gretarsson, T. Takayama, H. Takagi, and B. Keimer
Phys. Rev. Lett. 127, 227201 – Published 22 November 2021
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Abstract

Spin-orbit Mott insulators composed of t2g4 transition metal ions may host excitonic magnetism due to the condensation of spin-orbital J=1 triplons. Prior experiments suggest that the 4d antiferromagnet Ca2RuO4 embodies this notion, but a J=0 nonmagnetic state as a basis of the excitonic picture remains to be confirmed. We use Ru L3-edge resonant inelastic x-ray scattering to reveal archetypal J multiplets with a J=0 ground state in the cubic compound K2RuCl6, which are well described within the LS-coupling scheme. This result highlights the critical role of unquenched orbital moments in 4d-electron compounds and calls for investigations of quantum criticality and excitonic magnetism on various crystal lattices.

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  • Received 10 July 2021
  • Accepted 18 October 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.227201

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Takahashi1,2, H. Suzuki1,*, J. Bertinshaw1, S. Bette1, C. Mühle1, J. Nuss1, R. Dinnebier1, A. Yaresko1, G. Khaliullin1, H. Gretarsson3, T. Takayama1,4, H. Takagi1,2,4, and B. Keimer1,†

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany
  • 2Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 3Deutsches Elektronen-Synchrotron DESY, Notkestrstraße 85, D-22607 Hamburg, Germany
  • 4Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

  • *Corresponding author. hakuto.suzuki@tohoku.ac.jp
  • Corresponding author. B.Keimer@fkf.mpg.de

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Issue

Vol. 127, Iss. 22 — 24 November 2021

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