%0 Journal Article
%T Magnetism and spin-orbit coupling in Ir-based double perovskites La$_(2-x$Sr$_x$CoIrO$_6$
%A A. Kolchinskaya
%A P. Komissinskiy
%A M. Baghaie Yazdi
%A M. Vafaee
%A D. Mikhailova
%A N. Narayanan
%A H. Ehrenberg
%A F. Wilhelm
%A A. Rogalev
%A L. Alff
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevB.85.224422
%X 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.
%U http://arxiv.org/abs/1206.4830v1