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arXiv · 2311.01621

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

Felix I. Frontini·Graham H. J. Johnstone·Naoya Iwahara·Pritam Bhattacharyya·Nikolay A. Bogdanov·Liviu Hozoi·Mary H. Upton·Diego M. Casa·Daigorou Hirai·Young-June Kim
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Abstract

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.

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Felix I. Frontini, Graham H. J. Johnstone, Naoya Iwahara, Pritam Bhattacharyya, Nikolay A. Bogdanov, Liviu Hozoi, Mary H. Upton, Diego M. Casa, Daigorou Hirai, Young-June Kim. 2023-11-02. Spin-orbit-lattice entangled state in A$_2$MgReO$_6$ (A = Ca, Sr, Ba) revealed by resonant inelastic X-ray scattering. https://doi.org/10.1103/physrevlett.133.036501

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