Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2

Details Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2 Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2

2009-02-26

arxiv.org/abs/0902.4492v1

New J. Phys. 11 (2009) 075004

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 8 figures

Scientific paper

10.1088/1367-2630/11/7/075004

We present 75As nuclear magnetic resonance data in the paramagnetic and magnetic states of single crystal CaFe2As2. The electric field gradient and the internal magnetic field at the As sites change discontinuously below the first order structural transition at T0 = 169 K. In the magnetic state, we find a single value of the internal hyperfine field consistent with commensurate antiferromagnetic order of Fe moments pointing in the ab plane. The spin lattice relaxation rate shows Korringa behavior for T

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