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27 April 2024

» arxiv » cond-mat/0107289

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Andreev reflection in Au/La_{2-x}Sr_{x}CuO_{4} point-contact junctions: separation between pseudogap and phase-coherence gap
R.S. Gonnelli ; A. Calzolari ; D. Daghero ; L. Natale ; G.A. Ummarino ; V.A. Stepanov ; M. Ferretti ;
Date:	13 Jul 2001
Journal:	J. Phys. Chem. Solids 63, 2369 (2002)
Subject:	Superconductivity \| cond-mat.supr-con
Abstract:	We made point-contact measurements with Au tips on La_{2-x}Sr_{x}CuO_{4} samples with 0.08 < x < 0.20 to investigate the relationship between superconducting gap and pseudogap. We obtained junctions whose conductance curves presented typical Andreev reflection features at all temperatures from 4.2 K up to T_c^A close to the bulk T_c. Their fit with the BTK-Tanaka-Kashiwaya model gives good results if a (s+d)-wave gap symmetry is used. The doping dependence of the low temperature dominant isotropic gap component Delta_{s} follows very well the T_{c} vs. x curve. These results support the separation between the superconducting (Andreev) gap and the pseudogap measured by angle-resolved photoemission spectroscopy (ARPES) and tunneling.
Source:	arXiv, cond-mat/0107289
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