Abstract
We review recent Point Contact Spectroscopy results obtained on the high T c oxides YBCO and LSCO, in the superconducting state. For Andreev type contacts, the shape of the V (I) characteristics at low voltages is consistent with an s wave symmetry of the superconducting state and not with a d wave symmetry. The enhanced conductance at voltages smaller than the gap indicates a Fermi velocity in the superconducting electrode that is within a factor of 2 of that of the normal Au point. This result is interpreted as reflecting strong correlation effects. The structure of the second derivative of the characteristics at voltages in the 100 meV range fits well the known phonon spectrum for LSCO, which we interpret as a sign of strong electron-phonon interaction. The possibility of phase separation in systems where strong electron phonon and strong correlation interactions coexist is discussed.
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