Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-14
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
In a conventional superconductor, the spin-lattice relaxation rate on all nuclei should have the same temperature dependence below Tc. We performed $^{23}$Na, $^{75}$As, and $^{59}$Co NMR studies on single crystals of NaFe0.95Co0.05As, and found that spin-lattice relaxation rates show very different temperature dependent power-law behavior on three sites. We propose that such site-dependent behavior is due to the facts that the superconductor has two gaps of very different sizes. The power-law exponent of each nucleus is affected by the strength of the hyperfine coupling to the small gap. We also found that the large superconducting gap on the cobalt site is smaller than on other two sites. It suggests a local suppression of the superconducting gap on the dopant site.
Chen Guo-Feng
He J.-B.
Ma Liangping
Wang Michelle D.
Xia Tian-Long
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