Abstract
We report a 119Sn nuclear magnetic resonance (NMR) investigation of Ca3Ir4Sn13 with superconducting transition temperature . The anomaly observed at in susceptibility and resistivity has been successfully identified by both Knight shift K and the temperature-divided spin lattice relaxation rate, . Detailed analysis indicates that the hyperfine coupling constant changes at , suggesting the variation of the electronic states with temperature approaching 45 K. Furthermore, shows a linear behavior with magnetic susceptibility χ above , indicating the existence of three-dimensional ferromagnetic spin fluctuations in the normal state of Ca3Ir4Sn13 above 45 K. The relation between spin fluctuations and superconductivity is discussed.
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