Abstract
The thermal conductivity in bulk samples of pure Zn and the Kondo alloy Zn-Mn have been measured in the temperature range 0.360 to about 1.0 K for concentrations 2.7, 6.0, 8.4, 10.0, and 11.7 ppm Mn. Our results for the depression of the superconducting to normal state transition temperature (T c) with Mn concentration and for the temperature dependence of the thermal conductivity of pure Zn agree with the results obtained by other workers. The ratio of the thermal conductances in the superconducting and normal states has been quantitatively compared with the Bardeen-Rickayzen-Tewordt and Ambegaokar-Griffin theories. We found agreement between the Ambegaokar-Griffin theory and experiment at all temperatures for Mn concentrations lower than 10.0 ppm and discrepancy between theory and experiment in the 10.0 ppm and 11.7-ppm samples. In the latter specimens the measured conductance ratio was greater than the theoretical predictions. For these two samplesT c occurs at about the temperature where ordering (impurity-impurity interactions) is observed in the normal state. We have analyzed our measurements using those solutions of the Kondo problem in superconductors dealing mainly with the existence of bound states in the energy gap, as well as available theories on the effects of impurity-impurity interactions. We have concluded that our results can be qualitatively understood using the ideas of Fowler and Maki and of Zittartz and Müller-Hartmann which give a bound state in the energy gap. It appears that the growth of the impurity band and spin ordering (impurity-impurity interactions) are intrinsically related.
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This work has been submitted as partial fulfillment for the degree of Doctor of Philosophy at Rutgers University.
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Sánchez, D.H. Thermal conductivity of the Kondo superconductor Zn-Mn. J Low Temp Phys 17, 101–120 (1974). https://doi.org/10.1007/BF00654547
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DOI: https://doi.org/10.1007/BF00654547