Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K39: 5d/4d Transition Metal Systems III
3:00 PM–5:24 PM,
Tuesday, March 7, 2023
Room: Room 231
Sponsoring
Unit:
DMP
Chair: Qing Huang, Louisiana State University
Abstract: K39.00002 : Dynamic Jahn-Teller effect and emergent magnetism in cubic 5d1 double perovskites
3:36 PM–3:48 PM
Presenter:
Naoya Iwahara
(Chiba University)
Authors:
Naoya Iwahara
(Chiba University)
Liviu F Chibotaru
(KU Leuven)
From this viewpoint, a family of 5d1 double perovskites is of great interest because they have strong spin-orbit and vibronic couplings [1].
The nature of the ordered multipolar phases in the 5d1 compounds is still puzzling.
In a Re compound, two types of quadrupolar orders develop simultaneously above the magnetic transition temperature, which disagrees with the previous predictions based on a spin-orbit model [2].
In Ta compounds, antiferromagnetic and ferro z2 quadrupole orders simultaneously develop at low temperature, while the mechanism is unknown [3].
In this work, we propose an effective model that includes the effects of the interplay of the spin-orbit and vibronic couplings, and on this basis explain the two unsolved questions.
Due to the dynamic Jahn-Teller effect on $d^1$ sites, the local quantum states respond not only spin-orbital superexchange interaction but also elastic interaction.
Varying the elastic interaction parameters, we reproduce the phases observed in the Re and Ta compounds.
[1] N. Iwahara, V. Vieru, and L. F. Chibotaru, Phys. Rev. B 98, 075138 (2018).
[2] D. Hirai et al., Phys. Rev. Research 2, 022063 (2020).
[3] H. Ishikawa et al., Phys. Rev. B 100, 045142 (2019).
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