Andreev reflection in Au/La2-xSrxCuO4 point-contact junctions: separation between pseudogap and phase-coherence gap
Abstract
We made point-contact measurements with Au tips on La2-xSrxCuO4 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 TcA close to the bulk Tc. 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 Deltas follows very well the Tc 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.
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