Interplay of the Jahn-Teller effect and spin-orbit coupling: The case of trigonal vibrations

Sergey V. Streltsov, Fedor V. Temnikov, Kliment I. Kugel, and Daniel I. Khomskii
Phys. Rev. B 105, 205142 – Published 31 May 2022

Abstract

We study an interplay between the orbital degeneracy and the spin-orbit coupling (SOC) giving rise to spin-orbital entangled states in concentrated systems (cooperative Jahn-Teller [JT] effect). As a specific example, we analyze the interaction of electrons occupying triply degenerate single-ion t2g levels with trigonal vibrations (the tT problem). A more general problem of the electron–lattice interaction involving both tetragonal and trigonal vibrations is also considered. It is shown that the result of such interaction crucially depends on the occupation of t2g levels leading to either the suppression or the enhancement of the JT effect by the SOC.

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  • Received 3 December 2021
  • Revised 14 February 2022
  • Accepted 18 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.205142

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sergey V. Streltsov1,2,*, Fedor V. Temnikov1, Kliment I. Kugel3,4, and Daniel I. Khomskii5

  • 1Institute of Metal Physics, S. Kovalevskoy St. 18, 620990 Ekaterinburg, Russia
  • 2Department of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russia
  • 3Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Izhorskaya str. 13, 125412 Moscow, Russia
  • 4National Research University Higher School of Economics, 101000 Moscow, Russia
  • 5II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany

  • *streltsov@imp.uran.ru

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Issue

Vol. 105, Iss. 20 — 15 May 2022

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