2D VORTEX-GLASS TRANSITION WITH T-G=0 K IN TL2BA2CACU2O8 THIN-FILMS DUE TO HIGH MAGNETIC-FIELDS

By dc transport measurements, current-voltage characteristics of Tl2Ba 2CaCu2O8 thin films were determined in magnetic fields up to 5 T. For high magnetic fields (3, 5 T), it is found that all data can be interp reted in terms of the 2D vortex-glass theory: (1) All E-j isotherms ca n be scaled onto one common branch applying the scaling suggested for a 2D vortex system; (2) the linear resistivity rho(lin)(T) as well as the nonlinear current density j(nl) are found to follow the predicted relations rho(lin)(T) proportional to exp[-(T-0/T)(p)] and j(nl)(T) pr oportional to T1+nu SD, respectively. Both scaling of E-j curves and f itting j(nl)(T) consistently lead to value nu(2D) = 2 as predicted by the 2D vortex-glass theory. Also, the values found for T-0 (200 +/- 30 K) and p (approximate to 1.58) are either experimentally reasonable o r within the limit expected by theory (p greater than or equal to 1).