| Popis: |
Three plasma excitation modes, the longitudinal (Erf//c) and the transverse (Hrf//c) Josephson plasma excitation modes as well as the surface impedance mode (Hrf //ab), have been measured in single crystalline Bi2Sr2CaCu208+δ in the vicinity of Tc at 35.6 GHz. We found that both Josephson plasma modes show a sharp softening phenomenon as temperature approach to Tc without significant broadening of the line width and without losing their intensities, and disappear above Tc, whereas the surface impedance behaves in a conventional manner. |
