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American Physical Society, Physical Review Letters, 25(87), 2001

DOI: 10.1103/physrevlett.87.257601

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13C NMR Investigation of the Superconductor MgCNi3 up to 800 K

Journal article published in 2001 by Pm M. Singer, T. He, T. Imai, Rj J. Cava, M. A. Hayward ORCID
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This paper is available in a repository.

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Abstract

We report C-13 NMR characterization of the new superconductor MgCNi3 [T. He et al., Nature (London) 411, 54 (2001)]. We found that both the uniform spin susceptibility and the spin fluctuations show a strong enhancement with decreasing temperature, and saturate below similar to 50 K and similar to 20 K, respectively. The nuclear spin-lattice relaxation rate 1/T-13(1) exhibits typical behavior for isotropic s-wave superconductivity with a coherence peak below T-c = 7.0 K that grows with decreasing magnetic field.