Density Fluctuation Mediated Superconductivity

Abstract

We conpare predictions of the mean-field theory of supercnductivity for metallic systems on the border of a density instability for cubic and tetragonal lattices. The calculations are based on a parametrisation of an effective interaction arising from the exchange of density fluctuations and assume that a single band is relevant for superconductivity. The results show that for comparable model parameters, desnity fluctuation mediated pairing is more robust in quasi-two dimensions than in three dimensions, and that the robustness of pairing increases gradually as one goes from a cubic to a more and more anisotropic tetragonal structure. We also find that the robustness of density fluctuation mediated pairing can depend sensitively on the incipient ordering wavevector. We discuss the similarities and differences between the mean-field theories of superconductivity for density and magnetically mediated pairing.

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• Universality Classes of Metal-Insulator Transitions in Strongly Correlated Electron Systems and Mechanism of High-Temperature Superconductivity
• Valence Instability and Superconductivity in Heavy Fermion Systems
• Magnetic-Field Control of Quantum Critical Points of Valence Transition
• Nonanalytic paramagnetic response of itinerant fermions away and near a ferromagnetic quantum phase transition
• Spin conservation and Fermi liquid near a ferromagnetic quantum critical point
• Superconductivity in Ce- and U-based "122" heavy-fermion compounds
• Valence Fluctuations Revealed by Magnetic Field Scan: Comparison with Experiments in YbXCu_4 (X=In, Ag, Cd) and CeYIn_5 (Y=Ir, Rh)
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• Evidence for a charge collective mode associated with superconductivity in copper oxides from neutron and x-ray scattering measurements of La${}_{2-x}$Sr${}_x$CuO${}_4$
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• Heavy Fermion superconductor CeCu${}_2$Si${}_2$ under high pressure: multiprobing the valence crossover
• Ward identities for strongly coupled Eliashberg theories
• Compressibility of $CeMI{n}_5$ and $C{e}_{2}MI{n}_8$ (M = Rh, Ir and Co) Compounds
• Evidence for a Kondo destroying quantum critical point in YbRh2Si2
• Heat Capacity of Single Crystal CuxTiSe2 Superconductors
• Non-Landau damping of magnetic excitations in systems with localized and itinerant electrons
• Finding New Superconductors: The Spin-Fluctuation Gateway to High Tc and Possible Room Temperature Superconductivity
• Nodal superconductivity and superconducting dome in new layered superconductor Ta4Pd3Te16
• Broken relationship between superconducting pairing interaction and electronic dispersion kinks in LSCO
• Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2
• Nodeless superconductivity in Ir${}_{1-x}$Pt${}_x$Te${}_2$ with strong spin-orbital coupling
• Anisotropy, disorder, and superconductivity in CeCu2Si2 under high pressure
• On the superconducting dome near antiferromagnetic quantum critical points