Magnetism in Re-based ferrimagnetic double perovskites
A. Winkler, N. Narayanan, D. Mikhailova, K. G. Bramnik, H. Ehrenberg,, H. Fuess, G. Vaitheeswaran, V. Kanchana, F. Wilhelm, A. Rogalev, A., Kolchinskaya, and L. Alff
TL;DR
This study investigates the magnetic moments of Re ions in ferrimagnetic double perovskites using XMCD, revealing large negative spin and positive orbital moments, and showing contributions from alkaline earth ions to overall magnetism.
Contribution
It provides new insights into the magnetic behavior of Re in double perovskites and highlights the role of alkaline earth ions in their magnetism.
Findings
Re ions exhibit large negative spin and positive orbital magnetic moments.
Finite magnetic moments are present in 'non-magnetic' Re compounds.
Alkaline earth ions contribute to the overall magnetism.
Abstract
We have investigated spin and orbital magnetic moments of the Re 5d ion in the double perovskites A2FeReO6 (A = Ba, Sr, Ca) by X-ray magnetic circular dichroism (XMCD) at the Re L(2,3) edges. In these ferrimagnetic compounds an unusually large negative spin and positive orbital magnetic moment at the Re atoms was detected. The presence of a finite spin magnetic moment in a 'non-magnetic' double perovskite as observed in the double perovskite Sr2ScReO6 proves that Re has also a small, but finite intrinsic magnetic moment. We further show for the examples of Ba and Ca that the usually neglected alkaline earth ions undoubtedly also contribute to the magnetism in the ferrimagnetic double perovskites.
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