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VOLUME 56 (1992) | ISSUE 7 | PAGE 364
Mechanism for high-Tc superconductivity in (Ca1-xSrx)1-yCuO2 with an "infinite" number of cuprate layers
A plasmon mechanism for superconductivity is discussed. In this mechanism the superconductivity results from a Cooper pairing of light carriers as a result of their interaction with collective excitations of the charge density of heavy carriers (acoustic plasmons). This occurs in layered crystals with closely packed superconducting layers, as the result of a proximity effect and local-field corrections. For this mechanism, the electron-plasmon interaction constant increases faster than linearly with an increase in the number (n) of interacting layers which are in a common, coherent superconducting state. The increase in the transition temperature Tc with increasing η then quickly reaches saturation because of strong-coupling effects. This circumstance explains the high value Tc> ПО К in the compound (Ca1_A;SrJC),„J,Cu02 as n—>oo.