High-Tc superconductivity is investigated by a microwave-cavity perturbation technique in the compound La1.8Sr0.2CuO4. Both the microwave loss and frequency shift show a rapid decrease at 39 K, the onset of the superconducting transition. A significant microwave absorption is also observed well below the transition. The data are used to determine the sample resistivity in the normal state and characterize the superconducting transition in an applied magnetic field.
ASJC Scopus subject areas
- Condensed Matter Physics