Coherence lengths for superconductivity in the two-orbital negative-U Hubbard model

Abstract

We study the peculiarities of coherency in the superconductivity of two-orbital system. The superconducting phase transition is caused here by the on-site intra-orbital attractions (negative-U Hubbard model) and inter-orbital pair-transfer interaction. The dependencies of critical and noncritical correlation lengths on interaction channels and band fillings are analyzed.

5 pages, 3 figures, Acta Physica Polonica (2012) in press

References in corpus (5)

• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Evolution and Control of Oxygen Order in a Cuprate Superconductor
• Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4
• Definitive experimental evidence for two-band superconductivity in MgB2
• Feshbach resonances and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors

Cited by in corpus (11)

• Effective Ginzburg-Landau free energy functional for multi-band isotropic superconductors
• Band filling effects on coherence lengths and penetration depth in the two-orbital negative-U Hubbard model of superconductivity
• Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells
• The role of electron-vibron interaction and local pairing in conductivity and superconductivity of alkali-doped fullerides
• Correlations of superconducting fluctuations in a two-gap system
• Two-gap superconductivity: interband interaction in the role of external field
• Giant amplification of Berezinskii-Kosterlitz-Thouless transition temperature in superconducting systems characterized by cooperative interplay of small-gapped valence and conduction bands
• BCS theory with the external pair potential
• Shrinking of fluctuation region in a two-band superconductor
• Collective excitations in two-band superconductors
• High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry