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.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 10, 2015
Summary
We studied the electronic structure of (Sr1-xLax)2RhO4. Electron doping weakens correlations, revealing it as a weakly correlated metal that becomes ferromagnetic due to Stoner instability.
Area of Science:
- Condensed matter physics
- Materials science
- Solid-state chemistry
Background:
- Investigating the electronic structure of correlated oxides is crucial for understanding their magnetic and conductive properties.
- Previous studies using LDA+U suggested significant correlation effects on spin-orbit splitting in (Sr1-xLax)2RhO4.
Purpose of the Study:
- To accurately determine the electronic structure of (Sr1-xLax)2RhO4.
- To clarify the role of electronic correlations and spin-orbit coupling in this material.
- To investigate the transition to ferromagnetic behavior with electron doping.
Main Methods:
- Combined density functional theory (DFT) and dynamical mean-field theory (DMFT).
- Accurate treatment of electronic correlations beyond static mean-field approximations.
Main Results:
- Electronic correlations do not significantly enhance spin-orbit splitting, contrary to LDA+U findings.
- The enhancement observed in LDA+U is an artifact of its static mean-field approximation.
- Electron doping (increasing x) reduces correlation effects, leading to increased quasi-particle bandwidth.
- (Sr1-xLax)2RhO4 is a weakly correlated metal.
- Stoner instability drives a transition to itinerant in-plane ferromagnetism around x=0.2.
Conclusions:
- DMFT provides a more accurate description of the electronic structure than LDA+U for this system.
- Electronic correlations play a less dominant role than previously thought.
- The material exhibits a doping-induced magnetic phase transition.
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