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The origin of magnetism in a supposedly nonmagnetic osmium oxide

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arxiv 2401.12035 v1 pith:5I6AADEJ submitted 2024-01-22 cond-mat.str-el

The origin of magnetism in a supposedly nonmagnetic osmium oxide

classification cond-mat.str-el
keywords couplingmagneticnonmagneticoxidesupposedlyx-rayaboveabsorption
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A supposedly nonmagnetic 5d$^1$ double perosvkite oxide is investigated by a combination of spectroscopic and theoretical methods, namely resonant inelastic X-ray scattering, X-ray absorption spectroscopy, magnetic circular dichroism, and multiplet ligand field calculations. We found that the large spin-orbit coupling admixes the 5d $t_{2g}$ and $e_g$ orbitals, covalency raises the 5d population well above the nominal value, and the local symmetry is lower than $O_h$. The obtained electronic interactions account for the finite magnetic moment of Os in this compound and, in general, of 5d$^1$ ions. Our results provide direct evidence of elusive Jahn-Teller distortions, hinting at a strong electron-lattice coupling.

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