NMR study of uranium ternary compound U3Cu3Sn4

The 63Cu and 119Sn Knight shifts in U3Cu3Sn4 are anisotropic, and their isotropic values versus the susceptibility curves are linear above about 80 K for 63Cu and 119Sn, yielding the hyperfine coupling constants Ahf=-4.8 and +35.7 kOe/μB for 63Cu and 119Sn, respectively. The small negative value of 63Ahf suggests d-like conduction electron states at Cu sites. The nuclear relaxation rate 1/T1 of 63Cu shows a dependence of T1T∝(T-36) above about 70 K, suggesting that U3Cu3Sn4 is an exchange-coupled system consisting of U 5f localized moments. (orig.)