Pressure-induced tetragonal magnetic order in FeSe

ORAL

Abstract

We present a microscopic study of magnetism and lattice distortion on FeSe single crystals by high-energy x-ray diffraction and time-domain Mössbauer spectroscopy over wide temperature and pressure ranges. The magneto-structural ground state can be tuned by pressure from a paramagnetic state with an orthorhombic lattice distortion through a strongly coupled magnetically ordered and orthorhombic state to a magnetically ordered state without an orthorhombic lattice distortion. Close to the reported maximum of the superconducting critical temperature, the orthorhombic distortion suddenly disappears and FeSe remains tetragonal down to the lowest temperature measured. Analysis of the structural and magnetic order parameters suggests an independent origin of the structural and magnetic ordering phenomena, and their cooperative coupling leads to the similarity with the canonical phase diagram of iron pnictides.

*Work at the Ames Laboratory was supported by the U. S. Department of Energy (DOE), BES, Division of Materials Sciences and Engineering, under Contract No. DEAC02-07CH11358. This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Presenters

  • Andreas Kreyssig

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory/Iowa State University
    • Ames Laboratory & Department of Physics, Iowa State University

Authors

  • Andreas Kreyssig

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory/Iowa State University
    • Ames Laboratory & Department of Physics, Iowa State University

  • Anna E. Böhmer

    • Ames Laboratory, Iowa State University, Ames; Karlsruhe Institute of Technology, Karlsruhe

  • Karunakar Kothapalli

    • Ames Laboratory, Iowa State University, Ames; King University, Bristol

  • Wageesha T Jayasekara

    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • John M. Wilde

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • Bing Li

    • Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames
    • Ames Laboratory/Iowa State University

  • Aashish Sapkota

    • Brookhaven National Laboratory
    • Ames Laboratory, Iowa State University, Ames; Brookhaven National Laboratory, Brookhaven

  • Benjamin G. Ueland

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • Pinaki Das

    • Ames Laboratory, Iowa State University, Ames; Argonne National Laboratory, Argonne

  • Yuming Xiao

    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Wenli Bi

    • APS, Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Jiyong Zhao

    • APS, Argonne National Lab
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Esen Alp

    • APS, Argonne National Lab
    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory, Argonne

  • Sergey L. Bud'ko

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • Paul C. Canfield

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • Robert J. McQueeney

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames

  • Alan I. Goldman

    • Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames