Transverse optical plasmons in layered superconductors

Details Transverse optical plasmons in layered superconductors Transverse optical plasmons in layered superconductors

1996-09-17

arxiv.org/abs/cond-mat/9609155v1

Czechoslovak Journal of Physics 46 (1996), 3165

Physics

Condensed Matter

Proceedings of LT21, in press, 4 pages, Latex with LTpaper.sty and epsfig.sty, 2 postscript figures

Scientific paper

10.1007/BF02548125

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 La$_{1.85}$Sr$_{0.15}$CuO$_4$

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