The Co$^{2+}$-Ir$^{5+}$ orbital hybridization in LaCaCoIrO$_6$ double perovskite
| Autor: | Bufaiçal, L., Veiga, L. S. I., Mardegan, J. R. L., Pohlmann, T., Francoual, S., Dhesi, S. S., Fontes, M. B., Bittar, E. M. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of Magnetism and Magnetic Materials 587, 171276 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.jmmm.2023.171276 |
| Popis: | 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 Comment: 19 pages, 6 figures |
| Databáze: | arXiv |
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