PHOTOEMISSION AND TUNNELING AS TESTS FOR FLUCTUATING SUPERCONDUCTIVITY ABOVE T(C) IN HIGH-T(C) SUPERCONDUCTORS

Authors
Citation
Ka. Park et R. Joynt, PHOTOEMISSION AND TUNNELING AS TESTS FOR FLUCTUATING SUPERCONDUCTIVITY ABOVE T(C) IN HIGH-T(C) SUPERCONDUCTORS, Physical review. B, Condensed matter, 48(22), 1993, pp. 16833-16836
Citations number
14
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
48
Issue
22
Year of publication
1993
Pages
16833 - 16836
Database
ISI
SICI code
0163-1829(1993)48:22<16833:PATATF>2.0.ZU;2-H
Abstract
We examine the hypothesis that fluctuating local superconducting order exists well above the critical temperature in high-T(c) materials. Th is might explain anomalies in the magnetic susceptibility of some of t hese systems. It could also create a gap or pseudogap in the density o f states, which could be measured by photoemission or tunneling experi ments. We compute the density of states for a two-dimensional tight-bi nding model with such local order in the coherent-potential approximat ion. The order parameter is taken to have a spatially random phase and constant magnitude. We calculate this magnitude by a Ginzburg-Landau method. The conclusion is that the disorder smooths out the gap in the density of states unless the local order parameter is larger than the zero-temperature gap.