Abstract
Oxygen-annealed TlBa_2(Ca_(3-y)Mg_y)Cu_4O_(12-δ) (y = 0; 0:5; 1:0; 1:5; 2) superconductors are synthesized at normal pressure, and the influence of doped Mg-atoms on the superconducting parameters at the microscopic level is investigated by carrying out a para-conductivity analysis. The samples have shown a tetragonal structure, and the unit cell volume decreases with increased Mg-doping. The onset temperature of superconductivity [T_c(onset)] and zero resistivity critical temperature [T_c(R=0)] decreases with Mg doping. The maximum magnitude of diamagnetism is observed for the samples with a Mg concentration of y = 2. The apical oxygen mode of the type Tl-O_A-Cu(2) and CuO_2 planar oxygen modes are softened, as observed in the FTIR (Fourier transform infrared spectroscopy) absorption measurements. The fluctuation induced conductivity (FIC) analysis of conductivity data has shown the enhancement of the inter-plane coupling and coherence length along the c-axis. These studies have shown that there is less suppression of the order parameter of the carriers from its value |ψ|^2 = 1 due to the proximity effect in the CuO_2 planes in the Mg-doped samples.
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