Spin-orbit-lattice entangled state in A\(_2\)MgReO\(_6\) (A = Ca, Sr, Ba) revealed by resonant inelastic X-ray scattering

The \(5d^1\) ordered double perovskites present an exotic playground for studying novel multi-polar 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 A\(_2\)MgReO\(_6\)...

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Published in:arXiv.org 2023-11
Main Authors: Frontini, Felix I, Johnstone, Graham H J, Iwahara, Naoya, Bhattacharyya, Pritam, Bogdanov, Nikolay A, Hozoi, Liviu, Upton, Mary H, Casa, Diego M, Hirai, Daigorou, Young-June, Kim
Format: Article
Language:English
Subjects:
Barium
Calcium
Electron spin
Entangled states
Ground state
Inelastic scattering
Information retrieval
Jahn-Teller effect
Lattice vibration
Perovskites
Phase transitions
Playgrounds
Spin-orbit interactions
Strontium
Temperature dependence
X-ray scattering
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Summary:The \(5d^1\) ordered double perovskites present an exotic playground for studying novel multi-polar 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 A\(_2\)MgReO\(_6\) (A = Ca, Sr, Ba) family of \(5d^1\) double perovskites. The spin-orbit excitations in these materials show a strongly asymmetric lineshape 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 \(5d^1\) double perovskites. Usage: Secondary publications and information retrieval purposes.
ISSN:2331-8422