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

arXiv comment19 pages, 6 figures

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Cited by in corpus (1)

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