Studies of the phonon modes and superconducting properties of Cu0.5Tl0.5Ba2Ca2Cu3−yZnyO10−δ (y = 0, 1.5, 2.5)

摘要: The phonon modes and superconducting properties of Cu0.5Tl0.5Ba2Ca2Cu3?yZnyO10?? (y = 0, 1.5, 2.5) have been investigated. To optimize the carriers in unit cell, annealing experiments were performed at different temperatures for times. resistivity ac-susceptibility measurements revealed that samples become optimally doped when they annealed 500??C 6?h. optimum concentration conducting ZnO2/CuO2 planes gives desired Fermi velocity VF is necessary enhanced superconductivity. volume cell observed through x-ray diffraction scans found to decrease with increase Zn doping, promoting an vector KF effective density states which results superconductivity parameters. These manifested importance apical oxygen type Cu(1)?OA?M(2) Tl?OA?M(2) CuO2 planar mode M(2)?Op?M(2) (where M Zn/Cu) Fourier transform infrared (FTIR) absorption studies are consistent measurements.