EFFECTS OF COLUMNAR DEFECTS AND INTRINSIC PINNING ON THE BOSE-GLASS TRANSITIONS OF YBA2CU3O7 AND BI2SR2CACU2O8 THIN-FILMS

We study the a.c.-resistivity (3 mHz-50 MHz) in the nb-plane of YBa2Cu 3O7 and Bi2Sr2CaCu2O8-films. c-axis grown on SrTiO3(001) and having al most identical zero-field performances. Searching for thermodynamic tr ansitions to stal?le ''glassy'' superconductivity in the presence of m agnetic fields (H) over right arrow, we observe a significant increase of the glass transitions T-g((H) over right arrow) in YBa2Cu3O7 when changing the orientation from (H) over right arrow parallel to (c) ove r right arrow to (H) over right arrow perpendicular to (c) over right arrow and also after creation of columnar defects parallel to (c) over right arrow (matching field H-phi = 10 kOe) for H less than or equal to Y-b. In the strongly anisotropic Bi2Sr2CaCu2O8, on the other hand, which exhibits non-superconducting TAFF-behavior in the pristine state , columnar defects (H-phi = 10 kOe) produce transitions to Bose-glass (BG) superconductivity in fields (H) over right arrow parallel to (c) over right arrow up to H-phi. Surprisingly, the columnar defects paral lel to (c) over right arrow raise the transition temperatures T-g(H), also for (H) over right arrow perpendicular to (c) over right arrow.