Resistance anomaly near superconducting-normal metal interface

Resistance anomaly in high-temperature superconductors (HTS) YBa2Cu3Ox (YBC O) and Bi2Sr2CaCu2Oy (BSCCO) thin film microstrips, covered by gold thin fi lm, was observed. The resistance of the microstrip bilayer increases up to about 30% above the bilayer normal state resistance R-N at the beginning of the superconducting phase transition. Although in a number of recent publi cations, reporting an increase of the electrical resistance above the super conductor normal state resistance R-n, concerning of nonequilibrium quasipa rticle and pair electrochemical potentials in mesoscopic systems, or as a r esult of structural nonhomogeneity of the samples, we argue that the resist ance anomaly in our HTS/Au bilayers is associated with the proximity effect that accompanies superconducting-normal metal interface. The sharpness of resistance peak confirms a possibility to prepare HTS/Au interface with ver y high quality.