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

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.

6 pages, 8 figures

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Cited by in corpus (21)

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• Compensation temperatures and exchange bias in La1.5Ca0.5CoIrO6
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• Magnetic properties of double perovskite $L{n}_2$CoIrO${}_6$ ($Ln$ = Eu, Tb, Ho): hetero-tri-spin $3d$-$5d$-$4f$ systems
• Competition between heavy-fermion and Kondo interaction in isoelectronic A-site ordered perovskites
• Orbital magnetization of correlated electrons with arbitrary band topology
• Spin-orbit effects in pentavalent Iridates: Models and materials
• Charge transfer energy in iridates: a hard x-ray photoelectron spectroscopy study
• Orbital magnetization and anomalous Hall effect in interacting Weyl semimetals
• The effect of structural and magnetic disorder on the 3$d$-5$d$ exchange interactions of La${}_{2-x}$Ca${}_x$CoIrO${}_6$
• Dynamical correlation enhanced orbital magnetization in VI${}_3$
• Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization
• Type-II antiferromagnetic ordering in double perovskite oxide Sr${}_2$NiWO${}_6$
• Complex magnetic properties in the mixed 4f -5d double perovskite iridates Ln2ZnIrO6 (Ln = Nd, Sm, Eu & Gd)
• Study of Nontrivial Magnetism in 3$d$-5$d$ Transition Metal based Double Perovskites
• Correlated Paramagnetism and Interplay of Magnetic and Phononic Degrees of Freedom in 3d-5d Coupled La2CuIrO6
• Electronic Structure and magnetism in Ir based double-perovskite Sr${}_2$CeIrO${}_6$
• The 3d and 5d electronic structures and orbital hybridization in Ba- and Ca-doped La2CoIrO6 double perovskite
• The Co${}^{2+}$-Ir${}^{5+}$ orbital hybridization in LaCaCoIrO${}_6$ double perovskite
• Ba-substitution induced evolution of structural and magnetic properties of La2-xBaxCoIrO6 double perovskites