A precursor superconductivity approach to magnetic field effects in the pseudogap phase
Journal
Physica B-Condensed Matter
Journal Volume
312
Pages
42-43
Date Issued
2002
Author(s)
Abstract
We study the upper critical field Hc2 (or Tc(H)), and T*(H) within the pseudogap state, using a mean field scheme which incorporates a strong pairing attraction; for small coupling, g, this approach reduces to BCS theory. However at larger g a pseudogap, Δpg is present at Tc which dramatically changes the behavior of the inferred coherence length ξ, relative to that of BCS theory. Similarly, the quadratic terms in a Ginzburg-Landau description, are modified by Δpg≠0. These pseudogap effects, in accord with experiment, are responsible for the fact that (i) ξ is weakly x-dependent (ii) and Tc is more strongly H dependent than is T*. Very near the superconductor-insulator transition ξ is predicted to quickly increase. © 2002 Elsevier Science B.V. All rights reserved.
Type
journal article