Regensburg 2016 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.35: Poster
Thursday, March 10, 2016, 15:00–18:30, Poster D
Variational Cluster Approximation for Iridates — •Teresa Schaller and Maria Daghofer — FMQ, Universität Stuttgart
We use the variational cluster approximation to investigate the phase diagram and one-particle spectral density of iridates, where kinetic energy, electronic interactions and spin-orbit coupling are all on comparable energy scales. The approach includes quantum fluctuations on a small cluster and exactly and included long-range order on a mean-field level. We will in particular investigate the filling of two holes in the t2g subshell, as is realized in some iridium compounds. Hund’s rule and spin-orbit coupling together favor then a local singlet ground state, while intersite exchange driven by the kinetic energy favors magnetism. We present the phase diagram resulting from this competition and the impact of crystal-field splitting.