Nuclear Magnetic Resonance and Relaxation in Itinerant Electron Ferromagnet Sc3In

Nuclear magnetic resonance and nuclear spin-lattice relaxation of 45 Sc in an itinerant-electron ferromagnet Sc 3 In have been studied in both ferro- and paramagnetic states. The temperature dependences of the Knight shifts and susceptibilities give the hyperfine field due to d-spin of +58.4 kOe per Bohr magneton per Sc atom suggesting strong s-d admixture in the wave function at the Fermi surface and the d-spin contribution to the susceptibility. The external field dependence of the internal field at 45 Sc has been measured and analyzed in terms of the hyperfine fields proportional to d-spin moment and the external field. The observed magnetic field dependence of ( T 1 T ) -1 in both states is explained very well by the self-consistent renormalization theory of spin fluctuations in which the effect of magnetic field was taken into account, in conjunction with the negative magnetoresistance measured by us.