The magnetic and transport properties of the compounds (Gd, Y)4Co3
- 1 December 1980
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 10 (12), 2819-2829
- https://doi.org/10.1088/0305-4608/10/12/021
Abstract
The magnetic susceptibility, magnetisation, electrical resistivity and thermopower were measured for the compounds (Gd,Y)4Co3, which form a complete solid solution. The localised f electrons of Gd exert a molecular field on the itinerant d electrons of Co, causing exchange splitting for the latter above about 70% Gd. Below this concentration the magnetic moment of Co is small, about 0.3 mu B per formula unit and arises from localised d electrons on certain Co sites. The exchange integral evaluated using the model developed by Bloch et al. (1975) characterising the molecular field varies rapidly for the Y rich compounds reflecting a rapid variation of the susceptibility of Y4Co3 with temperature. The electrical data show clearly the profound influence of the itinerant d electrons in causing high-temperature curvatures and of the localised f electrons in causing kinks at the Curie temperatures.Keywords
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