SUPERCONDUCTING PARAMETERS OF YBCO AND BSCCO FROM TUNNELING SPECTROSCOPY

The differential conductivities of Bi2Sr2CaCu2O8+x/Au and YBa2Cu3O7-de lta/Au point contacts were measured. The superconducting order paramet er ii and the Fermi velocity nu(F) Of both superconductors were determ ined making use of the modified Blonder-Tinkham-Klapwijk theory. The c oherence length and penetration depth of Bi2Sr2CaCu2O8+x and YBa2Cu3O7 -delta were calculated from Delta and nu(F), by applying a weak-coupli ng theory of superconductors with anisotropic single-particle dispersi on and order parameter. Our results are compared to other experimental data.