Field-induced spin reorientation and giant spin-lattice coupling in EuFe2 As2

Y. Xiao, Y. Su, W. Schmidt, K. Schmalzl, C. M.N. Kumar, S. Price, T. Chatterji, R. Mittal, L. J. Chang, S. Nandi, N. Kumar, S. K. Dhar, A. Thamizhavel, Th Brueckel

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39 Citations (Scopus)

Abstract

We have studied a EuFe2 As2 single crystal by neutron diffraction under magnetic fields up to 3.5 T and temperatures down to 2 K. A field-induced spin reorientation is observed in the presence of a magnetic field along both the a and c axes, respectively. Above critical field, the ground-state antiferromagnetic configuration of Eu2+ moments transforms into a ferromagnetic structure with moments along the applied field direction. The magnetic phase diagram for Eu magnetic sublattice in EuFe 2 As2 is presented. A considerable strain (∼0.9%) is induced by the magnetic field caused by the realignment of the twinning structure. Furthermore, the realignment of the twinning structure is found to be reversible with the rebound of magnetic field, which suggested the existence of magnetic shape-memory effect. The Eu moment ordering exhibits close relationship with the twinning structure. We argue that the Zeeman energy in combined with magnetic anisotropy energy is responsible for the observed spin-lattice coupling.

Original languageEnglish
Article number220406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number22
DOIs
Publication statusPublished - 2010 Jun 10

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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