We discuss the possible existance of transverse optical plasma modes in superlattices consisting of Josephson coupled superconducting layers. These modes appear as resonances in the current-current correlation function, as opposed to the usual plasmons which are poles in the density-density channel. We consider both bilayer superlattices, and single layer lattices with a spread of interlayer Josephson couplings. We show that our model is in quantitative agreement with the recent experimental observation by a number of groups of a peak at the Josephson plasma frequency in the optical conductivity of La1.85Sr0.15CuO4.
|Number of pages||4|
|Journal||Czechoslovak Journal of Physics|
|Publication status||Published - 1996|
|Event||21st International Conference on Low Temperature Physics (LT 21) - , Czech Republic|
Duration: 8-Aug-1996 → 14-Aug-1996
- CUPRATE SUPERCONDUCTORS
- COLLECTIVE MODES