Magnetoresistance in Dilute Pd-Based Alloys

Measurements have been made of the magnetoresistance of dilute (approximately 0.1 at.%) alloys of Fe and Co in a Pd matrix over a temperature range from 1.5 to 10 K and for fields of up to 60 kOe. The magnetoresistances follow the predictions of Yosida and show that the giant moments in these alloys can be described by $g$ factors of (2.9 ± 0.1) for both alloys and by $S$ values of ($4.5\mp 0.1$) for Fe and ($4.7\mp 0.1$) for Co. The enhancement of the $g$ factors is interpreted in terms of the enhanced Pauli susceptibility of the host and the exchange interaction between the local spins and the $d$-band conduction electrons, and is found to correlate well with the ferromagnetic ordering temperatures observed in these alloys if only the on-site spin is considered.