Condensed Matter Physics, 2010, vol. 13, No. 4, p. 43704:1-16

Title: Superconducting states in strongly correlated systems with nonstandard quasiparticles and real space pairing: an unconventional Fermi-liquid limit
  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, PL-30-059 Kraków Poland)

We use the concept of generalized (almost localized) Fermi Liquid composed of nonstandard quasiparticles with spin-dependence effective masses and the effective field induced by electron correlations. This Fermi liquid is obtained within the so-called statistically-consistent 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 Fulde-Ferrell state of the heavy-fermion liquid, and the d-wave 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 Bardeen-Cooper-Schrieffer (BCS) type of state.

Key words: correlated fermions, high temperature superconductivity, unconventional superconductivity, real space pairing, heavy fermions, t-J model, Kondo pairing, FFLO state
PACS: 74.20.-z, 71.27.+a, 71.10.Ca

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