Abstract
Spin and orbital contributions to the magnetic moment of rhenium have been studied across the magnetostructural transition in ${\text{Ca}}_{2}{\text{FeReO}}_{6}$ double perovskite employing x-ray magnetic circular dichroism (XMCD) at the $\text{Re}\text{ }{L}_{2,3}$ edges. Temperature-dependent measurements performed in pulsed magnetic field varying from 6.8 to 30 T revealed that the two phases of this compound are characterized by a different spin-orbit coupling. At $T=10\text{ }\text{K}$, the average orbital-to-spin moment ratio of the Re sublattice increases in the application of 30 T magnetic field by $\ensuremath{\sim}5%$, while at $T=250\text{ }\text{K}$ it is field independent and amounts to $|{m}_{L}/{m}_{S}|=0.362(6)$. The field and temperature dependences of the rhenium XMCD and bulk magnetization are explained within the scenario of a field-induced phase coexistence and transition between two monoclinic phases of diverse magnetocrystalline coupling.
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