We have investigated doping effects on the transition temperature (Tc) of La2 −xMxCuO4 (M=Ca, Na and K) by incorporating the effects of two-dimensional (2D) acoustic plasmons in the framework of the strong coupling theory. The contributions from 2D acoustic plasmon mechanism toTc have been obtained from a Fourier-transformed effective potential, which has been earlier found to be successful in predicting the composition dependence ofTc in La2 −x(Ba, Sr)xCuO4. The results obtained by us on the variation of transition temperature with composition (x) in La2−xMxCuO4 superconductors are in reasonably good agreement with the available experimental data. This success has led to the conclusion that 2D acoustic plasmons are adequate to explain the pairing mechanism and the variation ofTc with composition (x) in cuprate superconductors.
Volume 43, 2020
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