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, T1-1 exhibits a small peak at 10 K, revealing the presence of slow spin fluctuations that may be associated with domain wall motion.
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