Cooper pairing with finite angular momentum: BCS versus Bose limits

Quintanilla, Jorge and Gyorffy, Balazs L. (2003) Cooper pairing with finite angular momentum: BCS versus Bose limits. Journal of Physics A: Mathematical and General, 36 (35). pp. 9379-9390. ISSN 0305-4470. (Full text available)

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Abstract

We revisit the old problem of exotic superconductivity as Cooper pairing with finite angular momentum emerging from a central potential. Based on some general considerations, we suggest that the phenomenon is associated with interactions that keep electrons at some particular, finite distance r(0), and occurs at a range of intermediate densities n similar to 1/r(0)(3). We discuss the ground state and the critical temperature in the framework of a standard functional-integral theory of the BCS to Bose crossover. We find that, due to the lower energy of two-body bound states with l = 0, the rotational symmetry of the ground state is always restored on approaching the Bose limit. Moreover in that limit the critical temperature is always higher for pairs with l = 0. The breaking of the rotational symmetry of the continuum by the superfluid state thus seems to be a property of weakly-attractive, non-monotonic interaction potentials, at intermediate densities.

Item Type: Article
Additional information: International Workshop on Strongly Correlated Electrons in New Materials, LOUGHBOROUGH, ENGLAND, DEC 14-17, 2002
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Jorge Quintanilla
Date Deposited: 14 Oct 2010 14:40
Last Modified: 29 Apr 2014 14:21
Resource URI: http://kar.kent.ac.uk/id/eprint/25615 (The current URI for this page, for reference purposes)
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