SIMULATION OF EXPERIMENTAL RESULTS ON HIGH-T-C SUPERCONDUCTORS - A PHENOMENOLOGICAL MODEL

A model based on a conductance expressed as a superposition of two BCS -like contributions and a linear one is proposed for the analysis of t he tunneling spectra of the 90 and 60 K phases of the YBaCuO compounds . A consistent explanation of the experiments, supported by satisfacto ry quantitative fittings of the experimental data in both the supercon ducting and the normal state, is presented with a careful study of the role played by the linear term. The possible extension of the model t o other copper-oxide superconductors is also discussed. Referring to a simplified one-gap version of the model, theoretical results concerni ng the behavior of the specific heat and the ultrasonic attenuation co efficients are found to be in good qualitative agreement with the expe riments.