Theoretical study on the iron-based ladder: metal-insulator and antiferromagnetic transitions

ORAL

Abstract

The recent discovery of superconductivity in BaFe2X3 (X=S/Se) under high pressure has stimulated researchers’ enthusiasm for the study of 123-type iron chalcogenides. These materials own quasi-one-dimensional two-leg ladders, which is structurally and thus physically different from previously studied iron-based superconductors with two-dimensional iron sheets. For the S-based case, our first-principles calculations show that the lattice constants as well as local magnetic moments are gradually suppressed with increasing pressure, followed by a first-order magnetic transition at a critical pressure[1]. The self-doping effect, namely the electrons transfer from S to Fe, may play a key role in this transition[1]. Although the superconducting dome has also been reported in the Se-based case, our calculations on BaFe2Se3 have unveiled several qualitative differences from BaFe2S3. Sequential transitions, including structural, electronic, and magnetic transitions, are found with increasing pressure[2].
[1] Y. Zhang, L. F. Lin, J. J. Zhang, E. Dagotto, and S. Dong, Phys. Rev. B 95, 115154 (2017).
[2] Y. Zhang, L. F. Lin, J. J. Zhang, E. Dagotto, and S. Dong, Phys. Rev. B, (under review).

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Presenters

  • Yang Zhang

    Southeast University, School of Physics, Southeast University

Authors

  • Yang Zhang

    Southeast University, School of Physics, Southeast University

  • Ling-Fang Lin

    Southeast University, School of Physics, Southeast University

  • Jun-Jie Zhang

    School of physics, Southeast University, School of Physics, Southeast University

  • Elbio Dagotto

    Univ. of Tennessee, Physics and Astronomy, University of Tennessee, Department of Physics and Astronomy, Univ of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, University of Tennessee, University of Tennessee & Oak Ridge National Laboratory, Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Shuai Dong

    School of physics, Southeast University, Southeast University, School of Physics, Southeast University