Abstract
Spin and orbital contributions to the magnetic moment of rhenium have been studied across the magnetostructural transition in double perovskite employing x-ray magnetic circular dichroism (XMCD) at the 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 , the average orbital-to-spin moment ratio of the Re sublattice increases in the application of 30 T magnetic field by , while at it is field independent and amounts to . 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.
- Received 27 February 2009
DOI:https://doi.org/10.1103/PhysRevB.79.220402
©2009 American Physical Society