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

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 $\sigma (\omega )$ 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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