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Field-induced spin reorientation and giant spin-lattice coupling in EuFe2As2

EuFe2As2 is a peculiar member of the iron arsenide AFe2As2 family since the Asite is occupied by Eu2+, which is an S-state orbital angular momentum L = 0 rare-earth ion possessing a 4f7structure with the total electron spin S


=7/2. 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 aand caxes, respectively.

The magnetic phase diagram for Eu magnetic sublattice in EuFe2As2 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, whichsuggested the existence of magnetic shape-memory effect. We argue that the Zeeman energy combined with magnetic anisotropy energy is responsible for the observed spin-lattice coupling.

Y. Xiao et al., “Field-induced spin reorientation and giant spin-lattice coupling in EuFe2As2” Phys. Rev. B 81, 220406(R) (2010).

Contact: Yixi Su

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