Physics – Condensed Matter – Superconductivity
Scientific paper
2000-04-27
Phys. Rev. B 62, 11778 (2000).
Physics
Condensed Matter
Superconductivity
20 pages with one embedded ps figure. Minor revisions to the text and references. Final version to appear in PRB on Nov. 1st,
Scientific paper
10.1103/PhysRevB.62.11778
We study the superconducting instability in systems with long but finite ranged, attractive, pairing interactions. We show that such long-ranged superconductors exhibit a new class of fluctuations in which the internal structure of the Cooper pair wave function is soft, and thus lead to "pseudogap" behavior in which the actual transition temperature is greatly depressed from its mean field value. These fluctuations are {\it not} phase fluctuations of the standard superconducting order parameter, and lead to a highly unusual Ginzburg-Landau description. We suggest that the crossover between the BCS limit of a short-ranged attraction and our problem is of interest in the context of superconductivity in the underdoped cuprates.
Sondhi Shivaji L.
Yang Kun
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