Microscopic phase diagram of Eu(Fe1-xNix)As2 (x = 0,0.04) under pressure

Academic Article

Abstract

  • To establish the microscopic P-T phase diagram of recent 112-type iron-pnictides Eu(Fe1-xNix)As2 (x = 0, 0.04), high-pressure synchrotron Mössbauer spectroscopy experiments in Eu151 and Fe57 have been performed. In EuFeAs2 application of pressure completely suppresses the itinerant electron magnetism from the Fe sublattice and the local-moment magnetism in Eu ions at ∼10 and ∼11.6GPa, respectively. High-pressure x-ray diffraction experiments in EuFeAs2 reveal an anomalous change in the lattice parameters and a discontinuity in volume around 10 GPa, suggesting an isostructural transition at this pressure. With Ni-doping (x = 0.04), a collapse of local magnetic order occurs at ∼8GPa, a lower critical pressure compared with the parent compound. In both systems, the suppression of local-moment magnetism is associated with a significant increase of mean valence in Eu ions.
  • Published In

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

    Author List

  • Bi W; Nix Z; Dutta U; Zhao J; Alp EE; Zhang D; Chow P; Xiao Y; Liu YB; Cao GH
  • Volume

  • 103
  • Issue

  • 19