Journal Article

PreJuSER-9914

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Field-induced spin reorientation and giant spin-lattice coupling in EuFe2As2

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

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10986  doi:10.1103/PhysRevB.81.220406

Abstract: We have studied a EuFe2As2 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 EuFe2As2 is presented. A considerable strain (similar to 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Streumethoden (IFF-4)
2. Neutronenstreuung (IFF-5)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
4. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2010

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