Condensed Matter Physics, 2010, vol. 13, No. 4, p. 43704:116
DOI:10.5488/CMP.13.43704
Title:
Superconducting states in strongly correlated systems with nonstandard quasiparticles and real space pairing: an unconventional Fermiliquid limit
Author(s):

J. Spałek
(Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL163016059 Kraków, Poland; Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Reymonta 19, PL30059 Kraków Poland)

We use the concept of generalized (almost localized) Fermi Liquid composed of nonstandard quasiparticles with spindependence effective masses and the effective field induced by electron correlations. This Fermi liquid is obtained within the socalled statisticallyconsistent Gutzwiller approximation (SGA) proposed recently [cf. J. Jędrak et al., arXiv: 1008.0021] and describes electronic states of the correlated quantum liquid. Particular emphasis is put on real space pairing driven by the electronic correlations, the FuldeFerrell state of the heavyfermion liquid, and the dwave superconducting state of high temperature curate superconductors in the overdoped limit. The appropriate phase diagrams are discussed showing in particular the limits of stability of the BardeenCooperSchrieffer (BCS) type of state.
Key words:
correlated fermions, high temperature superconductivity, unconventional superconductivity, real space pairing, heavy fermions, tJ model, Kondo pairing, FFLO state
PACS:
74.20.z, 71.27.+a, 71.10.Ca
