The magnetic field position of the peak of the derivative of the non-resonant microwave absorption in the high temperature superconductor Bi2Sr2CaCu2O8+δ is shown to depend on whether the applied magnetic field is increasing or decreasing. The magnitude of this hysteresis, which is due to flux trapping, differs from that observed in YBa2Cu3O6+x and for the present samples is independent of the maximum field applied. It does depend on whether the sample is cooled below Tc in a magnetic field or in zero field. The temperature dependence of the intensity of the absorption is shown to be consistent with the temperature dependence of the current in a Josephson junction assuming the presence of a superconducting gap obeying a mean field temperature dependence.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering