UNIVERSALITY OF GLASS SCALING IN A YBA2CU3O7-DELTA THIN-FILM

The universal behavior of the continuous superconducting (glass) phase transition is studied in a YBa2Cu3O7-delta thin film, An analysis tec hnique for extracting critical exponents is developed. using current v oltage (J-E) measurements. The method places narrow limits on the glas s scaling exponents, z(g) and nu(g), as well as the glass-transition t emperature, T-g(H). The universal values z(g)=3.8+/-0.2 and nu(g)=1.8/-0.1 are obtained. Using these values, the data are scaled for fields in the range 1-9 T. Collapse of the scaling forms at different fields describes the universal scaling function. The field dependence of the universal collapse is interpreted In terms of the three-dimensional X Y multicritical scaling theory.