Authors

Citation

A. Kobayashi et al., Pseudo gap and superconducting gap in the d-p model, J PHYS CH S, 62(1-2), 2001, pp. 199-202

Citations number

21

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Apllied Physucs/Condensed Matter/Materiales Science

Journal title

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS

ISSN journal

0022-3697
→ ACNP

Volume

62

Issue

1-2

Year of publication

2001

Pages

199 - 202

Database

ISI

SICI code

0022-3697(200101/02)62:1-2<199:PGASGI>2.0.ZU;2-Y

Abstract

We investigate pseudo gap and superconducting gap by using the extended sel
f-consistent t-matrix approximation (ESTA) in the d-p model. We take the pa
iring interaction mediated by the spin fluctuation and calculate the single
-particle spectrum, the density of states and the superconducting gap Delta
(sc)(k). The superconducting fluctuation induces excitaion gap Delta (fl)(
k)(k) and large damping of quasi-particles, Gamma (k,omega), with d(x2-y2)
symmetry. The effective gap Delta (k), which consists of Delta (fl)(k) and
Delta (sc)(k), smoothly increases across the superconducting transition tem
perature T-c as T decreases. As the hole-doping rate delta decreases, d(k)
increases monotonously, while T,has a maximum at delta congruent to 0.11 an
d decreases in the underdoped region. The damping near the Fermi energy rea
ches a maximum at T,followed by sharp drop as T decreases. The pseudo gap i
n the density of states is induced by not only Delta (k) but the omega -dep
endence of T(k,omega). (C) 2000 Elsevier Science Ltd. All rights reserved.