NMR Investigation of Environment Effect in C-15 Type R_1−xY_xCo₂ Pseudobinary Compounds; R=Pr and Ho

Abstract

Curie temperature, magnetization and ⁵⁹Co NMR have been measured for the pseudobinary R_1−xY_xCo₂ (R=Pr and Ho). In the Pr system, the hyperfine field distribution curve of Co obtained from the NMR spectra shows a well resolved satellite structure, while in the Ho system no additional structure appears in the distribution curve by replacing Ho with Y. These results are discussed in terms of a local environment effect of Co atoms and of the metamagnetic nature of the onset of the Co moment. It is suggested that the Pr moment increases with increasing Y concentration becuase of a decrease in the crystal field.