Phys Rev Lett. 2008 Oct 17;101(16):167203. Epub 2008 Oct 14.

Low energy spin waves and magnetic interactions in SrFe2As2.

Zhao J, Yao DX, Li S, Hong T, Chen Y, Chang S, Ratcliff W 2nd, Lynn JW, Mook HA, Chen GF, Luo JL, Wang NL, Carlson EW, Hu J, Dai P.

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Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996-1200, USA.

Abstract

We report inelastic neutron scattering studies of magnetic excitations in antiferromagnetically ordered SrFe2As2 (T_{N}=200-220 K), the parent compound of the FeAs-based superconductors. At low temperatures (T=7 K), the magnetic spectrum S(Q,Planck's omega) consists of a Bragg peak at the elastic position (Planck's omega=0 meV), a spin gap (Delta< or =6.5 meV), and sharp spin-wave excitations at higher energies. Based on the observed dispersion relation, we estimate the effective magnetic exchange coupling using a Heisenberg model. On warming across T_{N}, the low-temperature spin gap rapidly closes, with weak critical scattering and spin-spin correlations in the paramagnetic state. The antiferromagnetic order in SrFe2As2 is therefore consistent with a first order phase transition, similar to the structural lattice distortion.

PMID:: 18999708; [PubMed]

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