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

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

2005-04-13

arxiv.org/abs/cond-mat/0504343v1

Physics

Condensed Matter

Superconductivity

5 pages, accepted for publication in European Physical Journal B

Scientific paper

10.1140/epjb/e2005-00252-x

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.

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