Abstract
Element- and orbital-selective x-ray absorption and magnetic circular dichroism measurements are carried out to probe the electronic structure and magnetism of Ir electronic states in double perovskite (, Ca, Sc, Ti, Ni, Fe, Zn, In) and compounds. All the studied systems present a significant influence of spin-orbit interactions in the electronic ground state. In addition, we find that the Ir local magnetic moment shows different character depending on the oxidation state despite the net magnetization being similar for all the compounds. Ir carries an orbital contribution comparable to the spin contribution for and oxides, whereas the orbital contribution is quenched for samples. Incorporation of a magnetic atom allows getting insight into the magnetic coupling between and transition metals. Together with previous susceptibility and neutron diffraction measurements, the results indicate that Ir carries a significant local magnetic moment even in samples without a metal. The size of the (small) net magnetization of these compounds is a result of predominant antiferromagnetic interactions between local moments coupled with structural details of each perovskite structure.
2 More- Received 19 December 2014
- Revised 30 April 2015
DOI:https://doi.org/10.1103/PhysRevB.91.214433
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