Dynamic Jahn-Teller effect in the strong spin-orbit coupling regime
Year: 2024
Type: article
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.
Authors: Živković, Ivica, Soh, Jian-Rui, Malanyuk, Oleg, Yadav, Ravi, Pisani, Federico, Tehrani, Aria M., Tolj, Davor, Pasztorova, Jana, Hirai, Daigorou, Wei, Yuan, Zhang, Wenliang, Galdino, Carlos, Yu, Tianlun, Ishii, Kenji, Demuer, Albin, Yazyev, Oleg V., Schmitt, Thorsten, Rønnow, Henrik M.
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6910567458
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