The Co${}^{2+}$-Ir${}^{5+}$ orbital hybridization in LaCaCoIrO${}_6$ double perovskite

Abstract

Here, we report on the structural, electronic, and magnetic properties of a polycrystalline sample of the LaCaCoIrO${}_6$ double-perovskite investigated by means of synchrotron x-ray powder diffraction, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism at the Co and Ir $L_{2,3}$ edges, magnetometry, and electrical transport. Our results indicate a configuration of nearly Co${}^{2+}$/Ir${}^{5+}$ configuration for the transition-metal ions, with spin canting within the Co antiferromagnetic superstructure responsible for the ferromagnetic-like behavior observed below 100 K. The highly insulating character of LaCaCoIrO${}_6$ and its positive magnetoresistance further suggest that this antiferromagnetic superexchange interaction occurs through an indirect hybridization between the Co $e_g$ orbitals

19 pages, 6 figures

References in corpus (5)

• Ab-inito study of low temperature magnetic properties of double perovskite Sr2FeOsO6
• Magnetism and spin-orbit coupling in Ir-based double perovskites La${}_{(}2-x$Sr${}_x$CoIrO${}_6$
• Long-range magnetic interaction and frustration in double perovskite Sr${}_2$NiIrO${}_6$
• The effect of structural and magnetic disorder on the 3$d$-5$d$ exchange interactions of La${}_{2-x}$Ca${}_x$CoIrO${}_6$
• Study of Nontrivial Magnetism in 3$d$-5$d$ Transition Metal based Double Perovskites

Cited by in corpus (1)

• Ba-substitution induced evolution of structural and magnetic properties of La2-xBaxCoIrO6 double perovskites