Nuclear Magnetic Resonances of Co59 in Gd1-xYxCo5

Abstract

The hyperfine field at the Co ⁵⁹ nucleus in Gd _{1- x} Y _x Co ₅ has been observed as a function of yttrium concentration. The resonance signals of Co ⁵⁹ at sites I and II were observed in these compounds. In GdCo ₅ , the field strengths at sites I and II were 180 and 167.5 kOe, respectively. The contribution of 4f electrons in gadolinium sublattice to the hyperfine field is at most 9 kOe. These results can be interpreted in terms of the contribution to the hyperfine field arising from the conduction electron polarizations.