Dynamic Jahn-Teller effect in the strong spin-orbit coupling regime
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Zivkovic, 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 Ronnow, Henrik M. |
| author_facet | Zivkovic, 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 Ronnow, Henrik M. |
| contents | 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, often accompanied by ordering of spins and metal-insulator transitions. Static distortions, including cooperative behavior, have been associated with colossal magneto-resistance, multiferroicity, high-$T_\mathrm{C}$ superconductivity and other correlated phenomena. Realizations of the dynamic Jahn-Teller effect, on the other hand, are scarce since the preservation of vibronic symmetries requires subtle tuning of the local environment. Here we demonstrate that a highly-symmetrical 5d$^1$ double perovskite Ba$_2$MgReO$_6$, comprising of a 3D array of isolated ReO$_6$ octahedra, fulfils these requirements, resulting in a unique case of a dynamic Jahn-Teller system with strong spin-orbit coupling. Thermodynamic and resonant inelastic x-ray scattering experiments undoubtedly show that the Jahn-Teller instability leads to a ground-state doublet, invoking a paradigm shift for this family of compounds. The restoration of vibronic degrees of freedom arises from a quantum-mechanical zero-point motion, as revealed by detailed quantum chemistry calculations. The dynamic state of ReO$_6$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_01436 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dynamic Jahn-Teller effect in the strong spin-orbit coupling regime Zivkovic, 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 Ronnow, Henrik M. Strongly Correlated Electrons 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, often accompanied by ordering of spins and metal-insulator transitions. Static distortions, including cooperative behavior, have been associated with colossal magneto-resistance, multiferroicity, high-$T_\mathrm{C}$ superconductivity and other correlated phenomena. Realizations of the dynamic Jahn-Teller effect, on the other hand, are scarce since the preservation of vibronic symmetries requires subtle tuning of the local environment. Here we demonstrate that a highly-symmetrical 5d$^1$ double perovskite Ba$_2$MgReO$_6$, comprising of a 3D array of isolated ReO$_6$ octahedra, fulfils these requirements, resulting in a unique case of a dynamic Jahn-Teller system with strong spin-orbit coupling. Thermodynamic and resonant inelastic x-ray scattering experiments undoubtedly show that the Jahn-Teller instability leads to a ground-state doublet, invoking a paradigm shift for this family of compounds. The restoration of vibronic degrees of freedom arises from a quantum-mechanical zero-point motion, as revealed by detailed quantum chemistry calculations. The dynamic state of ReO$_6$ 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. |
| title | Dynamic Jahn-Teller effect in the strong spin-orbit coupling regime |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.01436 |