Dynamic Jahn-Teller effect in the strong spin-orbit coupling regime

Ivica Živković (), Jian-Rui Soh, Oleg Malanyuk, Ravi Yadav, Federico Pisani, Aria M. Tehrani, Davor Tolj, Jana Pasztorova, Daigorou Hirai, Yuan Wei, Wenliang Zhang, Carlos Galdino, Tianlun Yu, Kenji Ishii, Albin Demuer, Oleg V. Yazyev, Thorsten Schmitt and Henrik M. Rønnow
Additional contact information
Ivica Živković: École Polytechnique Fédérale de Lausanne
Jian-Rui Soh: École Polytechnique Fédérale de Lausanne
Oleg Malanyuk: École Polytechnique Fédérale de Lausanne
Ravi Yadav: École Polytechnique Fédérale de Lausanne
Federico Pisani: École Polytechnique Fédérale de Lausanne
Aria M. Tehrani: ETH Zurich
Davor Tolj: École Polytechnique Fédérale de Lausanne
Jana Pasztorova: École Polytechnique Fédérale de Lausanne
Daigorou Hirai: Nagoya University
Yuan Wei: Paul Scherrer Institute
Wenliang Zhang: Paul Scherrer Institute
Carlos Galdino: Paul Scherrer Institute
Tianlun Yu: Paul Scherrer Institute
Kenji Ishii: National Institutes for Quantum Science and Technology
Albin Demuer: LNCMI
Oleg V. Yazyev: École Polytechnique Fédérale de Lausanne
Thorsten Schmitt: Paul Scherrer Institute
Henrik M. Rønnow: École Polytechnique Fédérale de Lausanne

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Exotic quantum phases, arising from a complex interplay of charge, spin, lattice and orbital degrees of freedom, are of immense interest to a wide research community. A well-known example of such an entangled behavior is the Jahn-Teller effect, where the lifting of orbital degeneracy proceeds through lattice distortions. Here we demonstrate that a highly-symmetrical 5d1 double perovskite Ba2MgReO6, comprising a 3D array of isolated ReO6 octahedra, represents a rare example of a dynamic Jahn-Teller system in the strong spin-orbit coupling regime. Thermodynamic and resonant inelastic x-ray scattering experiments, supported by quantum chemistry calculations, undoubtedly show that the Jahn-Teller instability leads to a ground-state doublet, resolving a long-standing puzzle in this family of compounds. The dynamic state of ReO6 octahedra persists down to the lowest temperatures, where a multipolar order sets in, allowing for investigations of the interplay between a dynamic JT effect and strongly correlated electron behavior.

Date: 2024
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DOI: 10.1038/s41467-024-52935-w

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