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- Title
Proximity Effect of Pb on CeCu[sub 6] and La[sub 0.05]Ce[sub 0.95]Cu[sub 6].
- Authors
Chen, Tar-Pin; Tipparachi, Udom; Yang, H. D.; Wang, J. T.; Chen, Benjamin; Chen, Jean C. J.
- Abstract
Heavy fermion materials have attracted a great deal of attention since 1979. These materials which contain a rare earth (U, or Ce, etc.) element exhibit unusual behavior at low temperature. The effective mass m[sup *] of the Landau quasiparticles is found to be orders of magnitude higher than that of a bare electron. Some of the Heavy Fermion materials become superconductors at low temperature. The pairing of electrons in these superconductors may not be of s symmetry like those in BCS type superconductors. The mismatch in electronic mass and the difference in pairing state between the light conventional superconducting electrons and the heavy fermion electrons have brought the coupling between light electrons (BCS type) and the heavy fermion electrons into question. Proximity effect of Pb on CeCu[sub 6], Pb on La[sub 0.05]Ce[sub 0.95]Cu[sub 6], and Pb on Cu was used to investigate the coupling between the conventional superconducting electrons of Pb and the heavy electrons in CeCu[sub 6] or La[sub 0.05]Ce[sub 0.95]Cu[sub 6]. In this experiment proximity effect was found between Pb and CeCu[sub 6], as well as between Pb and La[sub 0.05]Ce[sub 0.95]Cu[sub 6]. However, the proximity effect is small when compare with that between Pb and Cu. This indicates a much shorter extrapolation length in the heavy fermion materials than in Cu. Such a phenomenon can be explained by the mismatch in effective mass between the superconducting Pb electrons and the heavy fermion electrons.
- Subjects
FERMIONS; SUPERCONDUCTORS; PHYSICS
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 1999, Vol 13, Issue 29/31, p3642
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979299003593