VORTEX-GLASS-LIQUID TRANSITION IN BI2SR2CACU2O8 BI2SR2CA2CU3O10 INTERGROWTH SINGLE-CRYSTALS/

The vortex-glass-liquid transition in Bi-Sr-Ca-Cu-O (BSCCO) intergrowt h single crystals in which some CuO2 trilayers are inserted into the B i2Sr2CaCu2O8 matrix has been studied. The curvature of the log V-log I curves for CuO2 trilayers is found to change from negative to positiv e with increasing magnetic field and a scaling behaviour for the vorte x-glass state is observed. The magnetic field dependence of the vortex -glass transition temperature, T-G, qualitatively obeys the relation H (T-G) similar to (T-c - T-g)(2v0), with v(0) = 1.15 +/- 0.2, which is larger than the 2/3 predicted theoretically for an isotropic 3D system . Our results reveal that the vortex-glass transition exists in a syst em constructed with CuO2 trilayers. (C) 1997 Elsevier Science Ltd.