Resistance transition and anisotropy of TBCCO/LAO high temperature superconducting thin films

Tl₂Ba₂CaCu₂O₈(TBCCO) films were deposited on LaAlO₃ (LAO) substrates by magnetron sputtering. The results of SEM and XRD show the films have high quality. The resistive transitions of the TBCCO/LAO were investigated at different magnetic fields using a standard four-probe method. The resistive transition broadening of TBCCO/LAO can be seen and it is stronger with the magnetic field perpendicular to the films than with the magnetic field parallel to the films. The thermally activated flux flow theory was used for analyzing the resistive transition broadening. The anisotropy of the films was discussed by analyzing the resistive transition.