Abstract
The layered electron gas (LEG) model has been used to calculate theeffective potential (using three types of 2D polarizability which arebased on tight binding approximation, random phase approximation andmarginal Fermi liquid approxiation) for cuprate superconductors whichconsist of one and two Cu–O layers per unit cell, respectively.The calculated effective potential has then been averaged over wavevector and a comparative study of effective potentials is made. It isnoticed that the calculated effective potentials usingpolarizabilities based on tight binding approximation and marginalFermi liquid approximation give comparatively better descriptions ofcuprate superconductors. The possible use of our calculated effectivepotential to compute TC for superconductors hasbeen suggested. It is found that the net attractive effectivepotential can be obtained within the LEG model for q (a–b plane component of the wave vector)smaller than one-tenth of the Fermi wave vector.
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