Systematic trends in the electronic structure parameters of 4d transition metal oxides SrMO_{3} (M = Zr, Mo, Ru, and Rh)
Y. S. Lee, J. S. Lee, T. W. Noh, Douck-Young Byun, Kwang Soo Yoo, K. Yamaura, E. Takayama-Muromachi
Abstract
We investigated the electronic structures of the perovskite-type 4d transition metal oxides SrMO_3 (M = Zr, Mo, Ru, and Rh) using their optical conductivity spectra \sigma (\omega). The interband transitions in \sigma (\omega) are assigned, and some important physical parameters, such as on-site Coulomb repulsion energy U, charge transfer energy \Delta_{pd}, and crystal field splitting 10Dq, are estimated. It is observed that \Delta _{pd} and 10Dq decrease systematically with the increase in the atomic number of the 4d transition metal. Compared to the case of 3d transition metal oxides, the magnitudes of \Delta_{pd} and 10Dq are larger, but those of U are smaller. These behaviors can be explained by the more extended nature of the orbitals in the 4d transition metal oxides.