Abstract
Major superconducting state parameter of high-Tc electron-doped Nd-Ce-CuO and hole-doped La-Sr-CuO systems have been estimated. The analysis is based on the electronic energy band structure (EEBS) within the local density approximation. Anisotropy of the layered structure is well reflected in the shape of open Fermi surface. Determination of the effective mass of the charge carrier from the Fermi velocity using EEBS and estimates of the anisotropic superconducting state parameters, particularly the magnetic penetration depth (λL), lead to smaller values than those observed by muon spin relaxation (μSR) measurements on polycrystalline samples. The coherence length (ξ∥ andξ⊥) is evaluated and appears to be higher. The temperature dependence of the Ginzburg-Landau parameter (K) and along the plane magnetic penetration depth (λ L ∥ ) shows the same nature as those revealed from experiments. Furthermore, results on lower and upper critical magnetic field are also presented. The results based on EEBS studies are consistent but do not agree well with experiments. On the other hand, if the Fermi Liquid approach (FLA) parameters are used for this analysis, the results are in better agreement with those reported earlier. The implications of the above investigations are discussed.
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