Specific heat measurements are reported in detail for the Ce impurity in the superconducting matrix systems Th65Sc35Ce, Th80Y20Ce, and Th65Y35Ce. The variation of the specific heat jump ΔC at the superconducting transition temperature T c is indicative of the magnetic nature of an impurity. For Th65Y35Ce a departure is found from the BCS law of corresponding states predicted for a nonmagnetic impurity. This departure is correlated with that observed for (La, Th)Ce systems and related to ΔT c/n (initial slope of T c vs. n) and Ce effective size (implied by lattice parameter data).
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Research supported in part by the Organization of American States, Multinational Project on Physics, and the Consejo Nacional de Investigationes Científicas y Técnicas (subsidio no. 6450/74) (to JGS); the U. S. Energy Research and Development Administration under contract no. ERDA E(04-3)-34 PA227 (to CAL and MBM); and the National Science Foundation under contract no. DMR 75-09494 (to JGH).
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Sereni, J.G., Huber, J.G., Luengo, C.A. et al. Calorimetric study of the magnetization of Ce impurities in superconducting Th-Y and Th-Sc alloys. J Low Temp Phys 30, 729–737 (1978). https://doi.org/10.1007/BF00116208
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DOI: https://doi.org/10.1007/BF00116208