Magnetism and spin-orbit coupling in Ir-based double perovskites La$_(2-x$Sr$_x$CoIrO$_6$

A. Kolchinskaya; P. Komissinskiy; M. Baghaie Yazdi; M. Vafaee; D. Mikhailova; N. Narayanan; H. Ehrenberg; F. Wilhelm; A. Rogalev; L. Alff

doi:10.1103/PhysRevB.85.224422

Magnetism and spin-orbit coupling in Ir-based double perovskites La$_(2-x$Sr$_x$CoIrO$_6$

Strongly Correlated Electrons 2012-06-22 v1

Authors: A. Kolchinskaya , P. Komissinskiy , M. Baghaie Yazdi , M. Vafaee , D. Mikhailova , N. Narayanan , H. Ehrenberg , F. Wilhelm , A. Rogalev , L. Alff

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Abstract

We have studied Ir spin and orbital magnetic moments in the double perovskites La $_{2-x}$ Sr $_x$ CoIrO $_6$ by x-ray magnetic circular dichroism. In La $_2$ CoIrO $_6$ , Ir $^{4+}$ couples antiferromagnetically to the weak ferromagnetic moment of the canted Co $^{2+}$ sublattice and shows an unusually large negative total magnetic moment (-0.38\, $\mu_{\text B}$ /f.u.) combined with strong spin-orbit interaction. In contrast, in Sr $_2$ CoIrO $_6$ , Ir $^{5+}$ 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.

Keywords

double perovskites spin-orbit coupling x-ray magnetic circular dichroism magnetic moments La2CoIrO6 Sr2CoIrO6 antiferromagnetic coupling

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@article{arxiv.1206.4830,
  title  = {Magnetism and spin-orbit coupling in Ir-based double perovskites La$_(2-x$Sr$_x$CoIrO$_6$},
  author = {A. Kolchinskaya and P. Komissinskiy and M. Baghaie Yazdi and M. Vafaee and D. Mikhailova and N. Narayanan and H. Ehrenberg and F. Wilhelm and A. Rogalev and L. Alff},
  journal= {arXiv preprint arXiv:1206.4830},
  year   = {2012}
}

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6 pages, 8 figures

Magnetism and spin-orbit coupling in Ir-based double perovskites La$_(2-x$Sr$_x$CoIrO$_6$

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