Superconductivity along the c axis of cuprate superconductor is maintained by the Josephson coupling between the CuO2 layers. Combining the Josephson current with the electromagnetic field, we have the Josephson plasma whose frequency appears in the range of 100 GHz and 1 Tera Hz in cuprate superconductors. In the presence of the vortices, the effective Josephson coupling responsible for the plasma is weakened and the plasma frequency is reduced. This effect may explain the temperature dependence of the plasma frequency observed in the mixed state of Bi2Sr2CaCu2O8+δ The interaction between the Josephson plasma and the vortices is strong enough to excite the plasma by the vortex flow. The excited plasma will decay by emitting the electromagnetic wave, since the plasma frequency is much smaller than the superconducting energy gap and the plasma has no other decay process.
|Number of pages||7|
|Journal||Chinese Journal of Physics|
|Issue number||2 II|
|Publication status||Published - 1996 Dec 1|
ASJC Scopus subject areas
- Physics and Astronomy(all)