Frustrated magnetism and quantum transitions of nematic phases in FeSe

ORAL

Abstract

The iron-based superconductivity has been known to develop near an antiferromagnetic order, but this paradigm apparently fails in FeSe. This system displays a nematic order while being non-magnetic. We show that the phase diagram of FeSe can be described by a quantum spin model with highly frustrated interactions. We perform density matrix renormalization group calculations on a frustrated spin-1 bilinear-biquadratic model on the square lattice, and find three stable phases breaking C4 rotational symmetry, including the antiferromagnetic states with wave vectors (0,π) and (π/2,π), and a (π,0) antiferroquadrupolar state. Tuning the ratio of competing interactions, we show quantum transitions from the (π,0) antiferroquadrupolar order to the (π,0) antiferromagnetic state, either directly or through the (π/2,π) antiferromagnetic order. Our findings explain the experimental observations of an orthorhombic antiferromagnetic order in the pressurized FeSe, and suggest that superconductivity in a wide range of iron-based materials has a common origin in the antiferromagnetic correlations of strongly correlated electrons.

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Presenters

  • Wenjun Hu

    Department of Physics and Astronomy, Rice University, Rice Univ, Department of Physics and Astronomy, Rice Univ

Authors

  • Wenjun Hu

    Department of Physics and Astronomy, Rice University, Rice Univ, Department of Physics and Astronomy, Rice Univ

  • Hsin-Hua Lai

    Department of Physics and Astronomy, Rice University, Rice Univ, Physics and Astronomy, and Rice Center for Quantum Materials, Rice University, Department of Physics and Astronomy, Rice Univ

  • Shoushu Gong

    Department of Physics, Beihang University, Beihang University, National High Magnetic Field Laboratory

  • Rong Yu

    Renmin University, Renmin University of China, Department of Physics, Renmin University of China

  • Andriy Nevidomskyy

    Department of Physics and Astronomy, Rice University, Physics and Astronomy, Rice University, Department of Physics and Astronomy, Rice Univ, Rice University

  • Qimiao Si

    Department of Physics and Astronomy, Rice University, Physics and Astronomy, Rice Univ, Physics and Astronomy, Rice University, Rice Univ, Rice Universiry, Physics, Rice University, Rice University, Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Physics and Astronomy, and Rice Center for Quantum Materials, Rice University, Department of Physics and Astronomy, Rice Univ