We studied the effects of oxygen-annealing temperature on the superconductivity of epitaxial HgBa2Ca2Cu3O8+y thin films fabricated by pulsed laser deposition. The highest transition temperature of 133 K for the films grown on (100) SrTiO3 was obtained after oxygen annealing at 340 °C for 12 h. The observed critical current density of 1.9×107 A/cm2 at 10 K, and 2.6×105 A/cm2 at 120 K in zero-field is high enough for the application of the superconducting quantum interference devices (SQUIDs) operated at 120 K. A dimensional crossover from 3D to 2D vortex states is observed from the temperature dependence of the irreversibility line.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering