Physics – Condensed Matter – Superconductivity
Scientific paper
2003-06-05
Phys. Rev. B 68, 174517 (2003)
Physics
Condensed Matter
Superconductivity
14 pages, 5 figures, REVTeX4, submitted to PRB; clarification of the diagrammatic technique added, one figure updated
Scientific paper
10.1103/PhysRevB.68.174517
It is well known that conventional pairing fluctuation theory at the Hartree level leads to a normal state pseudogap in the fermionic spectrum. Our goal is to extend this Hartree approximated scheme to arrive at a generalized mean field theory of pseudogapped superconductors for all temperatures $T$. While an equivalent approach to the pseudogap has been derived elsewhere using a more formal Green's function decoupling scheme, in this paper we re-interpret this mean field theory and BCS theory as well, and demonstrate how they naturally relate to ideal Bose gas condensation. Here we recast the Hartree approximated Ginzburg-Landau self consistent equations in a T-matrix form. This recasting makes it possible to consider arbitrarily strong attractive coupling, where bosonic degrees of freedom appear at $ T^*$ considerably above $T_c$. The implications for transport both above and below $T_c$ are discussed. Below $T_c$ we find two types of contributions. Those associated with fermionic excitations have the usual BCS functional form. That they depend on the magnitude of the excitation gap, nevertheless, leads to rather atypical transport properties in the strong coupling limit, where this gap (as distinct from the order parameter) is virtually $T$-independent. In addition, there are bosonic terms arising from non-condensed pairs whose transport properties are shown here to be reasonably well described by an effective time-dependent Ginzburg-Landau theory.
Chen Qijin
Iyengar Andrew
Levin Kathryn
Stajic Jelena
No associations
LandOfFree
The pseudogap state in superconductors: Extended Hartree approach to time-dependent Ginzburg-Landau Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The pseudogap state in superconductors: Extended Hartree approach to time-dependent Ginzburg-Landau Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The pseudogap state in superconductors: Extended Hartree approach to time-dependent Ginzburg-Landau Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-434286