Evidence for a metallic--like state in the T=0 K phase diagram of a high temperature superconductor

Abstract

We examine the effects of a phenomenological pseudogap on the T=0 K phase diagram of a high temperature superconductor within a self-consistent model which exhibits a d-wave pairing symmetry. At the mean-field level the presence of a pseudogap in the normal phase of the high temperature superconductor is proved to be essential for the existence of a metallic--like state in the density versus interaction phase diagram. In the small density limit, at high attractive interaction, bosonic--like degrees of freedom are likely to emerge. Our result should be relevant for underdoped high temperature superconductors, where there is a strong evidence for the presence of a pseudogap in the excitation spectrum of the normal state quasiparticles.

arXiv comment5 pages, accepted for publication in European Physical Journal B

References in corpus (13)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• The pseudogap in high-temperature superconductors: an experimental survey
• The doping dependence of T* - what is the real high-Tc phase diagram?
• Singular quasiparticle scattering in the proximity of charge instabilities
• Weak Pseudogap Behavior in the Underdoped Cuprate Superconductors
• On the correct strong-coupling limit in the evolution from BCS superconductivity to Bose-Einstein condensation
• Pseudogap effects induced by resonant pair scattering
• d-wave superconductivity near charge instabilities
• Mixed symmetry superconductivity in two-dimensional Fermi liquids
• Pseudogaps in Underdoped Cuprates
• Density-induced BCS to Bose-Einstein crossover
• 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''
• Specific heat behavior of high temperature superconductors in the pseudogap regime