title: (13)C NMR investigation of the superconductor MgCNi(3) up to 800 K.
abstract: We report (13)C NMR characterization of the new superconductor MgCNi(3) [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 approximately 50 K and approximately 20 K, respectively. The nuclear spin-lattice relaxation rate 1/(13)T(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.
authors.affiliation: Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Singer
authors.forename: T
authors.initials: T
authors.lastname: Imai
authors.forename: T
authors.initials: T
authors.lastname: He
authors.forename: M A
authors.initials: MA
authors.lastname: Hayward
authors.forename: R J
authors.initials: RJ
authors.lastname: Cava