We report 13C 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 ∼50K and ∼20K, respectively. The nuclear spin-lattice relaxation rate 1/13T1 exhibits typical behavior for isotropic s-wave superconductivity with a coherence peak below Tc =7.0K that grows with decreasing magnetic field.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)