Magnetic field induced superconductor-insulator transition and abnormal Hall effect in Y0.5Pr0.5Ba2Cu3O7-delta thin films

A magnetic field induced superconductor-insulator transition (SIT) in the Y 0.5Pr0.5Ba2Cu3O7-delta (YPBCO) thin films has been investigated in the puls ed magnetic fields up to 50 T. Meanwhile, the Hail effect in such YPBCO fil ms has also been investigated. With large current and high magnetic field, the Hall angle follows a power law with the temperature, i.e. cot theta (H) proportional to T-2. However, while the current and the magnetic field dec rease to 0.05 mA and 1 T respectively, a reversed Hall resistivity occurs n ear the T-C. Furthermore, the Hall resistivity is almost linear to the magn etic field, while the Hall number in high magnetic field is slightly lower than that in low magnetic field, exhibiting a magnetic field induced charge localization.