Comment on ``BCS to Bose-Einstein crossover phase diagram at zero temperature for a d_{x^2-y^2} order parameter superconductor: Dependence on the tight-binding structure''

Abstract

The work by Soares et al. [Phys. Rev. B 65, 174506 (2002)] investigates the BCS-BE crossover for d-wave pairing in the 2-dimensional attractive Hubbard model. Contrary to their claims, we found that a non-pairing region does not exist in the density vs coupling phase diagram. The gap parameter at T=0, as obtained by solving analytically as well as numerically the BCS equations, is in fact finite for any non-zero density and coupling, even in the weak-coupling regime.

7 pages, 1 figure

References in corpus (6)

• Phase Fluctuations and Pseudogap Phenomena
• The neutron resonance: modeling photoemission and tunneling data in the superconducting state of Bi_2Sr_2CaCu_2O_{8+d}
• Mixed symmetry superconductivity in two-dimensional Fermi liquids
• First-Order Pairing Transition and Single-Particle Spectral Function in the Attractive Hubbard Model
• Density-induced BCS to Bose-Einstein crossover
• Formation of d-wave superconducting order in a randomly doped lattice

Cited by in corpus (5)

• Review of Transition-Metal Diboride Thin Films
• Aluminium substitution induced superstructures in Mg1-xAlxB2 (x = 0.0 to 0.50): An X-ray diffraction study
• Effects of extended impurity perturbation in d-wave superconductor
• Cooper pairing with finite angular momentum: BCS vs Bose limits
• Evidence for a metallic--like state in the T=0 K phase diagram of a high temperature superconductor