Distinct pressure evolution of coupled nematic and magnetic orders in FeSe

Academic Article

Abstract

  • We present a microscopic study of nematicity and magnetism in FeSe over a wide temperature and pressure range using high-energy x-ray diffraction and time-domain Mössbauer spectroscopy. The low-temperature magnetic hyperfine field increases monotonically up to ∼6 GPa. The orthorhombic distortion initially decreases under increasing pressure but is stabilized at intermediate pressures by cooperative coupling to the pressure-induced magnetic order. Close to the reported maximum of the superconducting critical temperature at p=6.8GPa, the orthorhombic distortion suddenly disappears and a new tetragonal magnetic phase occurs. The pressure and temperature evolution of the structural and magnetic order parameters suggests that they have distinct origins.
  • Authors

    Published In

  • Physical Review B  Journal
  • Physical Review B  Journal
  • Digital Object Identifier (doi)

    Author List

  • Böhmer AE; Kothapalli K; Jayasekara WT; Wilde JM; Li B; Sapkota A; Ueland BG; Das P; Xiao Y; Bi W
  • Volume

  • 100
  • Issue

  • 6