The role of mobile carriers density supplied by TlBa 2 O 4−δ charge reservoir layer is investigated by doping Ce in TlBa 2 Ca 2 Cu 3 O 10−δ superconductors. The T c (onset) and T c (R = 0) versus Ce contents have shown almost a parabolic-shaped phase diagram which is interpreted in terms of hole's doping. The magnetic measurements showed that magnitude of diamagnetism is gradually suppressed with Ce doping at Tl site. Fourier transform infrared (FTIR) revealed that the phonon modes associated with apical oxygen atoms type Cu(2)-O A -Tl are softened, whereas the planar oxygen modes are hardened with the doping of Ce the unit cell. In the excess conductivity, analyses of conductivity data of Tl 1−x Ce x Ba 2 Ca 2 Cu 3 O 10−δ samples have shown a suppression of T cmf (K) and the width of 2D conductivity regimes, whereas the coherence length along the c-axis ξ c(0) and the interlayer coupling J are enhanced with the doping of Ce +4 in the charge reservoir. The increase in ξ c(0) is interpreted in the form of homogenization of the carrier's density of carriers the CuO 2 planes. The process of homogenization is accomplished with the reduction of density of carriers in the outer CuO 2 that consequently promotes increase in the phase relaxation time, τ φ , of the carriers, their Fermi velocity, and the energy required to break apart the Cooper pairs.
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