Abstract
The present paper deals with the superconducting state of a prototype of high transition temperature superconductor (SC) La 1.85Sr .15CuO 4 with strong 2D features and relatively low carrier concentration. The study is carried out within the Eliashberg framework by considering a two-component total vertex consisting of electron pairing mediated by quantized lattice waves as well as plasmons. For the latter part the low-frequency ionic-plasmon mode has been assumed to play an important role in preference to electronic-plasmon in bringing about superconductivity. We then derive an expression for the transition temperature T c applicable to layered SCs. A comparison of the calculated T c and other properties with experiments provides support to this type of generalised joint phonon-plasmon mechanism in LSCO. An extension of this formalism to still higher T c-materials, e.g. in YBCO, is encouraging. The possibility of interlayer hopping and the consequences of inclusion of non-adiabatic effects in interactions beyond Migdal's theorem are also discussed.
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