Abstract
This paper describes a search for valence instabilities of Pr impurities in ZrMe2 with Me=Os, Ir and Ru. Pr impurities go into solution in the 2% concentration range in ZrIr2 and ZrOs2 but not in ZrRu2. Susceptibility measurements indicate a nonmagnetic groundstate of Pr in both ZrIr2 and ZrOs2. The effective moment in ZrIr2 is slightly below the trivalent value in ZrIr2 while in ZrOs2 the susceptibility is far below the trivalent value between helium and room temperatures. The resistivity increments of the alloys are very large and show very unusual temperature dependence, even for stable rare-earth (RE) impurities in ZrIr2, where one observes strong deviations from the Matthiessen's rule at low temperatures. The depression of the superconducting transition temperature of ZrIr2 and ZrOs2 by Pr impurities is about 0.5 K/at%.
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Slebarski, A., Wohlleben, D. & Weidner, P. Valence instability of Pr impurities in ZrIr2 and ZrOs2 . Z. Physik B - Condensed Matter 61, 177–185 (1985). https://doi.org/10.1007/BF01307774
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DOI: https://doi.org/10.1007/BF01307774