Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2

N. J. Curro; A. P. Dioguardi; N. ApRoberts-Warren; A. C. Shockley; P. Klavins

doi:10.1088/1367-2630/11/7/075004

Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2

Strongly Correlated Electrons 2009-07-09 v1 Superconductivity

Authors: N. J. Curro , A. P. Dioguardi , N. ApRoberts-Warren , A. C. Shockley , P. Klavins

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Abstract

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<T0/3, reflecting the metallic nature of the ordered state. Surprisingly, 1/T1 exhibits a small peak at 10 K, revealing the presence of slow spin fluctuations that may be associated with domain wall motion.

Keywords

nuclear magnetic resonance CaFe2As2 antiferromagnetism spin dynamics knight shift spin-lattice relaxation

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@article{arxiv.0902.4492,
  title  = {Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2},
  author = {N. J. Curro and A. P. Dioguardi and N. ApRoberts-Warren and A. C. Shockley and P. Klavins},
  journal= {arXiv preprint arXiv:0902.4492},
  year   = {2009}
}

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11 pages, 8 figures

Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2

Abstract

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