Andreev reflection in Au/La_{2-x}Sr_{x}CuO_{4} point-contact junctions: separation between pseudogap and phase-coherence gap

@inproceedings{Gonnelli2001AndreevRI,
  title={Andreev reflection in Au/La_\{2-x\}Sr_\{x\}CuO_\{4\} point-contact junctions: separation between pseudogap and phase-coherence gap},
  author={Renato S. Gonnelli and Arrigo Calzolari and Dario Daghero and L. Natale and Giovanni Alberto Ummarino and Vladimir Alekseevich Stepanov and Maurizio Ferretti},
  year={2001}
}
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… CONTINUE READING