^<51>V NMR Study of A15 Superconductor V_3Si

概要

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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_3Si. 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_1T 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 X and 1/T_1T 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_1TK^2_d varies with temperature, which should also be explained with the narrow conduction band.
社団法人日本物理学会の論文
1995-04-15