Abstract
Layered nitride superconductor, Li 0.48( THF )y HfNCl with Tc=25.5 K , was investigated by means of nuclear magnetic resonance (NMR). 7 Li -, 35 Cl -NMR studies clarified that the partial electron density of states at Fermi level at Li and Cl sites are negligibly small. From the 15 N NMR Knight shift studies, the spin susceptibility decreases toward zero below Tc, evidencing that the pairing symmetry is an even-parity spin-singlet. These results indicate that superconductivity is derived from the HfN layer. We also measured 15 N -, 7 Li -NMR spin-lattice relaxation rate in the temperature range of 4.2K - 100 K and observed the enhancement of the spin-lattice relaxation rate, 1/ T 1, by field fluctuations generated by the vortex dynamics.
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