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Magnetism and spin-orbit coupling in Ir-based double perovskites La_{2−x}Sr_{x}CoIrO_{6}

Kolchinskaya, A. and Komissinskiy, P. and Yazdi, M. Baghaie and Vafaee, M. and Mikhailova, D. and Narayanan, N. and Ehrenberg, H. and Wilhelm, F. and Rogalev, A. and Alff, L. (2012):
Magnetism and spin-orbit coupling in Ir-based double perovskites La_{2−x}Sr_{x}CoIrO_{6}.
In: Physical Review B, American Physical Society, pp. 224422- (6 pages), 85, (22), ISSN 1098-0121, [Online-Edition: http://dx.doi.org/10.1103/PhysRevB.85.224422],
[Article]

Abstract

We have studied Ir spin and orbital magnetic moments in the double perovskites La2−xSrxCoIrO6 by x-ray magnetic circular dichroism. In La2CoIrO6, Ir4+ couples antiferromagnetically to the weak ferromagnetic moment of the canted Co2+ sublattice and shows an unusually large negative total magnetic moment (−0.38 μB/f.u.) combined with strong spin-orbit interaction. In contrast, in Sr2CoIrO6, Ir5+ has a paramagnetic moment with almost no orbital contribution. A simple kinetic-energy-driven mechanism including spin-orbit coupling explains why Ir is susceptible to the induction of substantial magnetic moments in the double perovskite structure.

Item Type: Article
Erschienen: 2012
Creators: Kolchinskaya, A. and Komissinskiy, P. and Yazdi, M. Baghaie and Vafaee, M. and Mikhailova, D. and Narayanan, N. and Ehrenberg, H. and Wilhelm, F. and Rogalev, A. and Alff, L.
Title: Magnetism and spin-orbit coupling in Ir-based double perovskites La_{2−x}Sr_{x}CoIrO_{6}
Language: English
Abstract:

We have studied Ir spin and orbital magnetic moments in the double perovskites La2−xSrxCoIrO6 by x-ray magnetic circular dichroism. In La2CoIrO6, Ir4+ couples antiferromagnetically to the weak ferromagnetic moment of the canted Co2+ sublattice and shows an unusually large negative total magnetic moment (−0.38 μB/f.u.) combined with strong spin-orbit interaction. In contrast, in Sr2CoIrO6, Ir5+ has a paramagnetic moment with almost no orbital contribution. A simple kinetic-energy-driven mechanism including spin-orbit coupling explains why Ir is susceptible to the induction of substantial magnetic moments in the double perovskite structure.

Journal or Publication Title: Physical Review B
Volume: 85
Number: 22
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 07 Jan 2014 09:47
Official URL: http://dx.doi.org/10.1103/PhysRevB.85.224422
Identification Number: doi:10.1103/PhysRevB.85.224422
Funders: This work was supported by the LOEWE-Centre AdRIA, by DFG through Grant No. SPP 1178, and by the European Synchrotron Radiation Facility (Grant Nos. HE-2379, HE- 2848, and HE-3567).
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