Doping-dependent bandwidth renormalization and spin-orbit coupling in (Sr1-xLax)2RhO4
Kyo-Hoon Ahn1, Kwan-Woo Lee, Jan Kuneš
1Department of Applied Physics, Graduate School, Korea University, Sejong 339-700, Korea.
Abstract:
We investigate the electronic structure of (Sr1-xLax)2RhO4 using a combination of the density functional and dynamical mean-field theories. Unlike the earlier local density approximation plus Hubbard U (LDA + U) studies, we find no sizable enhancement of the spin-orbit splitting due to electronic correlations and show that such an enhancement is a spurious effect of the static mean-field approximation of the LDA + U method. The electron doping suppresses the importance of electronic correlations, which is reflected in the quasi-particle bandwidth increasing with x. (Sr1-xLax)2RhO4 can be classified as a weakly correlated metal, which becomes an itinerant in-plane ferromagnet (but possibly A-type antiferromagnet) due to Stoner instability around x = 0.2.
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