Validity of the BCS model Hamiltonian in the limit of small sizes
Finite-size effects when the electronic level spacings become comparable to the bulk superconducting gap can suppress pairing correlations in small metallic particles. We examine an alternative mechanism for finite-size suppression of superconductivity: the role of the nonpair portion of the interaction, which could become important in small systems. We show that the crossover size at which the nonpair contribution becomes significant is typically already within the regime wherein finite level spacing suppresses the pairing correlations; however, the nonpair terms could become relevant in certain weak-coupled superconductors.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences; National Science Foundation (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 788057
- Report Number(s):
- LBNL-48699; R&D Project: 506501; TRN: US0110856
- Journal Information:
- Physical Review B, Vol. 62, Issue 13; Other Information: Journal Publication Date: 1 October 2000; PBD: 30 Apr 2000
- Country of Publication:
- United States
- Language:
- English
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