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.

–

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