Abstract
The Knight shift K and the spin-lattice relaxation rate 1/ T 1 of 51 V nuclei, and the macroscopic magnetic susceptibility have been measured in an A15 superconductor V 3 Si. From the K -χ plot, the hyperfine coupling constant and the temperature independent Van Vleck term have been estimated. In the normal state, 1/ T 1 T decreases drastically with increasing temperature. In the superconducting state, 1/ T 1 shows no coherence peak just below T c (=17.1 K), and obeys the T 3 -law down to T c /3, but deviates from it with decreasing temperature. It is shown that the temperature dependences of χ and 1/ T 1 T are well reproduced by the numerical calculation based on the narrow-band model at Fermi level, and that the band width should be much smaller than that given by the band calculation of Mattheiss and Weber. T 1 T K 2 d varies with temperature, which should also be explained with the narrow conduction band.
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