Direct evidence of the orbital contribution to the magnetic moment in AA'FeReO6 double perovskites
M. Sikora, D. Zajac, C. Kapusta, M. Borowiec, C. J. Oates, V., Prochazka, D. Rybicki, J. M. De Teresa, C. Marquina, M. R. Ibarra
TL;DR
This study provides direct experimental evidence of the orbital magnetic moments in AA'FeReO6 double perovskites, revealing their significant contribution to the overall magnetic behavior despite octahedral coordination.
Contribution
It is the first to directly measure and quantify the orbital magnetic moments of Re in these double perovskites using XMCD spectroscopy.
Findings
Orbital magnetic moments are significant in all studied compounds.
The orbital to spin moment ratio increases with lattice distortion.
Fe also exhibits a notable orbital moment in Ca2FeReO6.
Abstract
Spin and orbital magnetic moments of Re in AA'FeReO6 double perovskites (A,A' = Ba, Sr, Ca) have been directly probed employing XMCD spectroscopy at the Re L2,3-edges. A considerable orbital magnetic moment is observed in all the studied compounds despite octahedral coordination. Relative orbital to spin contribution per Re atom rises with lattice distortion from mL/mS = -0.28 to -0.34 for AA'=Ba2FeReO6 and Ca2FeReO6, respectively. A preliminary XMCD measurements at the Fe L2,3-edges reveals also a significant orbital moment of iron in Ca2FeReO6. The relation of the results to the magnetic properties of the compounds is discussed.
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