Dg. Xenikos et Tr. Lemberger, THE EFFECT OF AL DOPING ON THE CRITICAL SCALING OF YBA2CU3O7 FILMS, IN HIGH MAGNETIC-FIELDS, Physica. B, Condensed matter, 194, 1994, pp. 1913-1914
We present current-voltage characteristics (I-V) in YBa2(Cu1-xAlx)3O7
films (0 less-than-or-equal-to x less-than-or-equal-to 0.03), in magne
tic fields 0.5 less-than-or-equal-to B less-than-or-equal-to T, which
am consistent with the existence of a phase transition with critical e
xponents and scaling functions independent of Al concentration. We stu
dy the role of Al doping in flux pinning by analyzing the non-universa
l characteristics of the transition such as the width of the critical
regime, the characteristic length for vortex correlations, and the tem
perature and the resistivity that correspond to the onset of the criti
cal response.