MAGNETORESISTANCE AND THE EFFECT OF SUPERCONDUCTING FLUCTUATIONS IN YBA2CU3O7 PRBA2CU3O7 SUPERLATTICES/

The results of the magnetoresistance on two thin-film samples of YBa2C u3O7/PrBa2Cu3O7 superlattices have been reported for the temperatures near and below the superconducting transition temperature. The thermal ly activated flux-creep motion theory was used to describe the magneto resistance results at temperatures much lower than T-c. The existence of the superconducting fluctuation near T-c as well as the two-dimensi onal behavior of superlattices were studied by comparing the magnetore sistance results and Larkin's quasi-two-dimensional (2D) superconducti ng fluctuation theory. A good fit between experimental results and the ory was obtained and contrary to previous results, no crossover betwee n quasi-2D and 3D was observed.