Spin-Orbit-Lattice Entangled State in A2MgReO6 (A =Ca , Sr, Ba) Revealed by Resonant Inelastic X-Ray Scattering
Abstract
The 5 d1 ordered double perovskites present an exotic playground for studying novel multipolar physics due to large spin-orbit coupling. We present Re L3 edge resonant inelastic x-ray scattering (RIXS) results that reveal the presence of the dynamic Jahn-Teller effect in the A2MgReO6 (A =Ca , Sr, Ba) family of 5 d1 double perovskites. The spin-orbit excitations in these materials show a strongly asymmetric line shape and exhibit substantial temperature dependence, indicating that they are dressed with lattice vibrations. Our experimental results are explained quantitatively through a RIXS calculation based on a spin-orbit-lattice entangled electronic ground state with the dynamic Jahn-Teller effect taken into consideration. We find that the spin-orbit-lattice entangled state is robust against magnetic and structural phase transitions as well as against significant static Jahn-Teller distortions. Our results illustrate the importance of including vibronic coupling for a complete description of the ground state physics of 5 d1 double perovskites.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2024
- DOI:
- 10.1103/PhysRevLett.133.036501
- arXiv:
- arXiv:2311.01621
- Bibcode:
- 2024PhRvL.133c6501F
- Keywords:
-
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Materials Science