Correlation effects in KFe$_2$As$_2$, RbFe$_2$As$_2$ and CsFe$_2$As$_2$

ORAL

Abstract

We perform a systematic LDA+DMFT study of the iron-pnictide series KFe$_2$As$_2$\footnote{Backes {\it et al.}, New J. Phys. \textbf{16}, 083025 (2014)}, RbFe$_2$As$_2$ and CsFe$_2$As$_2$ and compare with available experiments. We find not only strong orbital-dependent renormalizations and Fermi surface topology changes compared to the local-density approximation but also interesting features at higher binding energies. We discuss the observation of a possible orbitally-selective instability as a function of isoelectronic doping\footnote{Backes {\it et al.}, in preparation}.

*Research funded within DFG SPP 1458.

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Authors

  • Steffen Backes

    • University Frankfurt

  • Harald O. Jeschke

    • Goethe University
    • Institut f\"ur Theoretische Physik, Goethe-Universit\"at Frankfurt, Max-von-Laue-Stra{\ss}e 1, 60438 Frankfurt am Main, Germany
    • Goethe-Universitaet Frankfurt
    • Institute for Theoretical Physics, University of Frankfurt, Frankfurt a.M., Germany
    • University Frankfurt

  • Roser Valenti

    • Goethe University
    • Institut f\"ur Theoretische Physik, Goethe-Universit\"at Frankfurt, Max-von-Laue-Stra{\ss}e 1, 60438 Frankfurt am Main, Germany
    • Goethe-Universitaet Frankfurt
    • Institute for Theoretical Physics, University of Frankfurt, Frankfurt a.M., Germany
    • University of Frankfurt
    • University Frankfurt