The effects of charge-carrier density modulation on critical currents and vortex dynamics in ultrathin YBa2Cu3O7-δ films were investigated through transport measurements in field-effect devices. Two distinct dissipation regions in resistive transitions in applied magnetic fields are identified by the electric-field effect. A Kosterlitz-Thouless-like transition is observed in zero magnetic field, which can be tuned by the electric field. The importance of thermal fluctuations for the dissipation in high-Tc superconductors is stressed.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)