Microscopic model of the mixed-valence iridates Ba3MIr2O9 (M = In, Lu)

ORAL

Abstract

Mixed-valence iridates Ba3MIr2O9 (M = In, Lu) where unpaired 5d electrons are localized on dimers of Ir atoms have been recently proposed as a source for novel spin liquid candidates[1]. Interestingly, the susceptibility measurements for Ba3InIr2O9 show an anomalous temperature dependence with the Curie-Weiss law holding up to 80 K only. We performed ab-initio density functional based calculations combined with exact diagonalization of finite clusters and find that electronic states of these systems are driven by a temperature-dependent subtle interplay of spin-orbit coupling and Coulomb repulsion at the dimer level [2].

[1] T. Dey, M. Majumder, J. C. Orain, A. Senyshyn, M. Prinz-Zwick, F. Bert, P. Khuntia, N. Büttgen, A. A. Tsirlin, P. Gegenwart, arXiv:1702.08305 (2017)
[2] Ying Li, Alexander A. Tsirlin, Igor I. Mazin, Stephen M. Winter, and Roser Valentí, in preparation

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Presenters

  • Ying Li

    Institute of Theoretical Physics, Goethe University Frankfurt

Authors

  • Ying Li

    Institute of Theoretical Physics, Goethe University Frankfurt

  • Alexander Tsirlin

    Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg

  • I.I. Mazin

    Code 6393, Naval Research Laboratory, U.S. Naval Research Laboratory, Center for Computational Materials Science Naval Research Laboratory, Naval Research Laboratory

  • Stephen Winter

    Goethe University, Institute of Theoretical Physics, Goethe University Frankfurt, Institut für Theoretische Physik, Goethe-Universität Frankfurt, Physics, Goethe University Frankfurt

  • Roser Valenti

    Institute of Theoretical Physics, Goethe University Frankfurt, Inst. Theoretical Physics, Goethe Univ. Frankfurt am Main, Institut für Theoretische Physik, Goethe-Universität Frankfurt