Superconducting properties of Cd doped Cu0.5Tl0.5Ba2Ca3Cu4−yCdyO12−δ (y = 0, 0.25, 0.5, 0.75, 1.0) superconductors

摘要: Abstract Cadmium doped Cu0.5Tl0.5Ba2Ca3Cu4−yCdyO12−δ (y = 0, 0.25, 0.5, 0.75, 1.0) samples have been synthesized and their superconducting properties are studied using X-ray diffraction (XRD), resistivity, ac-susceptibility Fourier Transform Infrared (FTIR) absorption measurements. These shown tetragonal structure, unit cell volume is decreased with the increased Cd doping. The zero resistivity critical temperature [Tc(R = 0)] decreases magnitude of diamagnetism suppressed concentration in superconductors. Tc(R = 0) these compounds improved after post-annealing oxygen atmosphere. It most likely that Cu0.5Tl0.5Ba2O4−δ charge reservoir layer optimizes density carriers conducting planes to desired level consequently increasing superconductivity final compound. Changes shape FTIR spectra doping incorporation compounds. measurements hardening apical modes type Cu(1)–OA–Cu(2)/Cdy vibration associated damped harmonic oscillations heavier atoms CuO2 which suppress phonons population from a reducing