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Journal Article

The electronic thermal conductivity of superconductors with paramagnetic impurities

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Moeser, J. H., Steglich, F., Leser, C., & Müller-Hartmann, E. (1976). The electronic thermal conductivity of superconductors with paramagnetic impurities. Zeitschrift für Physik B, 25(4), 339-349. doi:10.1007/BF01315249.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-BF5A-1
We have measured the thermal conductivitiesK s in the superconducting state andK n in the normal state of (La1−x REx) Al2 single crystals (RE: Gd, Ce;x≦0.005) between 0.4 and 8 K. The lattice conductivity is small in the superconducting state above 0.5T c and in the normal state and is independent of annealing. Annealing does, however, strongly depress the ratioK s e /K n e of the electronic thermal conductivities. We also report on a theory of the electronic thermal conductivity which describes the experimental results quantitatively. Interaction effects between impurities show up for the samples with the highest RE-concentration.