As-75 NMR studies of superconducting Ba0.72K0.28Fe2As2

Z. Li
K. Matano
D. L. Sun
G. L. Sun
C. T. Lin
M. Ichioka
G. -Q. Zheng

We have performed As-75 nuclear magnetic resonance measurements on a single crystal of the hole-doped superconductor Ba0.72K0.28Fe2As2 (T-c = 31.5 K). The spin-lattice relaxation rate 1/T-1 decreases below T-c with no coherence peak and shows a step-wise variation at low temperatures, which is indicative of multiple superconducting gaps. In the normal state, we find that Fe antiferromagnetic spin fluctuations are anisotropic. (C) 2009 Elsevier B.V. All rights reserved.

Physica C: Superconductivity and its Applications

ELSEVIER

470

S495

S496

10.1016/j.physc.2009.11.174

https://doi.org/10.1016/j.physc.2009.11.174
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