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Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and Ir)

S. J. Moon·M. W. Kim·K. W. Kim·Y. S. Lee·J. -Y. Kim·J. -H. Park·B. J. Kim·S. -J. Oh·S. Nakatsuji·Y. Maeno·I. Nagai·S. I. Ikeda·G. Cao·T. W. Noh
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Abstract

We investigated the electronic structures of the two-dimensional layered perovskite Sr$_{2}$\textit{M}O$_{4}$ (\textit{M}=4\textit{d} Ru, 4\textit{d} Rh, and 5\textit{d} Ir) using optical spectroscopy and polarization-dependent O 1\textit{s} x-ray absorption spectroscopy. While the ground states of the series of compounds are rather different, their optical conductivity spectra $σ(ω)$ exhibit similar interband transitions, indicative of the common electronic structures of the 4\textit{d} and 5\textit{d} layered oxides. The energy splittings between the two $e_{g}$ orbitals, $i.e.$, $d_{3z^{2}-r^{2}}$ and $d_{x^{2}-y^{2}}$, are about 2 eV, which is much larger than those in the pseudocubic and 3\textit{d} layered perovskite oxides. The electronic properties of the Sr$_{2}$\textit{M}O$_{4}$ compounds are discussed in terms of the crystal structure and the extended character of the 4\textit{d} and 5\textit{d} orbitals.

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S. J. Moon, M. W. Kim, K. W. Kim, Y. S. Lee, J. -Y. Kim, J. -H. Park, B. J. Kim, S. -J. Oh, S. Nakatsuji, Y. Maeno, I. Nagai, S. I. Ikeda, G. Cao, T. W. Noh. 2006-07-04. Electronic structures of layered perovskite Sr2MO4 (M=Ru, Rh, and Ir). https://doi.org/10.1103/physrevb.74.113104

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