Superconductivity in an anisotropic three-dimensional narrow-band system

D. K. Ray; J. Konior; A. M. Oleś; A. N. Das

doi:10.1103/PhysRevB.43.5606

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Superconductivity in an anisotropic three-dimensional narrow-band system

D. K. Ray, J. Konior, A. M. Oleś, A. N. Das

DOI 10.1103/PhysRevB.43.5606 · Physical Review B

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Abstract

In order to get an insight into the nature of superconductivity in high-Tc copper oxide superconductors, we have studied the fermion pairing of the s- and d-wave-types with an extended Hubbard model for an anisotropic three-dimensional system for different values of the anisotropy parameter r, which is a measure of increased coupling between the planes. At low hole concentration the superconducting transition temperature Tc is higher for the s wave and decreases with increasing r. For higher hole concentration the d wave is stable and the corresponding Tc is weakly dependent on r. Comparison of Tc’s for the s-wave pairing and the boson-condensation temperature for varying r shows that there may be a crossover from fermion pairing to boson condensation as r increases.