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arxiv: cond-mat/0106476 · v3 · submitted 2001-06-22 · ❄️ cond-mat.supr-con

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(13)C NMR investigation of the superconductor MgCNi₃ up to 800K

P.M. Singer , T. Imai , T. He , M.A. Hayward , R.J. Cava
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classification ❄️ cond-mat.supr-con
keywords belowdecreasingmgcnispinsuperconductorbehaviourcharacterizationcoherence
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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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