Effects of magnetic field orientation on the magnetoresistivity and activation energy of Y-doped Bi-2212 film

Abstract

The magnetic field orientation dependence of magnetoresistivity MR and activation energy U₀ was studied. It is found that MR and U₀ vary as a function of the magnetic field orientation which shows the anisotropic behavior of the film. The magnetic field applied perpendicular to c-axis gives shorter resistive transition width, lower MR, and higher activation energy. This suggests that the pinning ability of the film in the field perpendicular to the c-axis is stronger than that applied parallel. The presence of independently moving vortices along the superconducting planes in the parallel direction results to a weaker pinning force.