Effect of oxygen deficiency (delta) on normal state resistivity of YBa2Cu3O7-delta superconductors

We have investigated theoretically the effect of oxygen deficiency (6) on n ormal state resistivity rho) as well as its temperature dependence in YBa2C u3O7-delta superconductors. This has been based on a potential which incorp orates the structure factors and various interactions for double two-dimens ional (2-D) conducting CuO2 plane. Using the Coulomb and electron-phonon te rms of the interaction potential, we have then worked out the coupling stre ngth (gamma) for neighbouring electrons linked via 2-D acoustic phonons (h omega). Furthermore, the scattering time (tau(e-ph)) due to electron-phonon interaction is deduced. The variations in tau(e-ph) and rho(e-ph) are stud ied with oxygen deficiency (delta) which is in the range of 0.0 less than o r equal to delta less than or equal to 1.0, and the results thus obtained a re found to be consistent with the earlier reported data. The residual resi stivity rho(0) obtained by extrapolation from experimental data together wi th pe(-ph) will predict the nearly-linear behaviour of normal state resisti vity at temperatures (T) [90 less than or equal to T less than or equal to 300 K] in YBA(2)Cu(3)O(7-delta) superconductors.