Abstract
The paper analyzes the influence of the hole density, the out-of-plane or in-plane disorder, and the isotopic oxygen mass on the zero temperature energy gap (2Δ(0))Y1-xCaxBa2Cu1-yZny3O7-δ(YCBCZO) andLa1.96-xSrxHo0.04CuO4(LSHCO) superconductors. It has been found that the energy gap is visibly correlated with the value of the pseudogap temperature (T⋆). On the other hand, no correlation between 2Δ(0) and the critical temperature (TC) has been found. The above results mean that the value of the dimensionless ratio2Δ0/kBTCcan vary very strongly together with the chemical composition, while the parameter2Δ(0)/kBT⋆does not change significantly. In the paper, the analytical formula which binds the zero temperature energy gap and the pseudogap temperature has been also presented.
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