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∓0.1) for Fe and (4.7∓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.