(13)C NMR investigation of the superconductor MgCNi_3 up to 800K

Details (13)C NMR investigation of the superconductor MgCNi_3 up to 800K (13)C NMR investigation of the superconductor MgCNi_3 up to 800K

2001-06-22

arxiv.org/abs/cond-mat/0106476v3

Physics

Condensed Matter

Superconductivity

Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.257601

We report (13)C NMR characterization of the new superconductor MgCNi_3 (He et al., Nature (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 ~50K and ~20K respectively. The nuclear spin-lattice relaxation rate 1/(13)T_1T exhibits typical behaviour for isotropic s-wave superconductivity with a coherence peak below Tc=7.0K that grows with decreasing magnetic field.

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