The initial depressions of the superconducting transition temperature T c of LaSn3 by rare earth (RE) impurities are known to be anomalous. In an attempt to clarify this behavior, we have measured the pressure dependence of the T c of (LaRE)Sn3 alloys (RE = Y, Ce, Pr, Nd, Sm, Eu, Gd, and Lu) to pressures up to 25 kbar. The magnitude of the pressure dependence of the T c of (LaRE)Sn3 alloys containing RE impurities with partially filled 4f electron shells decreases monotonically with increasing RE atomic number. A general discussion of existing zero- and high-pressure data for various physical properties of (LaRE)Sn3 alloys demonstrates that the association of large pressure dependences of T c with the occurrence of unstable impurity 4f shells (the Kondo effect) should be made with caution. The experimental high-pressure results are analyzed in terms of appropriate theoretical models for magnetic and nonmagnetic localized impurity states in superconductors.
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Supported by the US DOE Contract E(04-3)-34PA227.
National Science Foundation Postdoctoral Fellow.
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De Long, L.E., Maple, M.B., McCallum, R.W. et al. Anomalous pressure dependences of the superconducting transition temperature of dilute alloys of LaSn3 containing light rare earth impurities. J Low Temp Phys 34, 445–485 (1979). https://doi.org/10.1007/BF00117163
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DOI: https://doi.org/10.1007/BF00117163