We present new Au/La2-xSrxCuO4 (LSCO) point-contact conductance measures as a function of voltage and temperature in samples with 0.08<x<0.2. Andreev reflection features disappear at about the bulk Tc, giving no evidence of gap for T>Tc. The fit of the normalized conductance at any T<Tc supports a (s+d)-wave symmetry of the gap, whose dominant low-T s component follows the Tc(x) curve in contrast with recent angle-resolved photoemission spectroscopy and quasiparticle tunneling data. These results prove the separation between pseudogap and phase-coherence superconducting gap in LSCO at x < 0.2.
|Titolo:||Evidence for pseudogap and phase-coherence gap separation by Andreev reflection experiments in Au/La2-xSrxCuO4 point-contact junctions.|
|Data di pubblicazione:||2001|
|Digital Object Identifier (DOI):||10.1007/PL00011150|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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