Superconducting Properties of CUO.5 Tlo.5 Ba2CaCu2_x Tix 0 8- 0 (x=O, 0.5, 1, 1.5, 2) Samples

Abstract

The solid-state reaction approach is used to create CUo sTlo.sBa2CaCu2_xTixOs-o (x=O, 0.5, 1, 1.5, 2.0) superconductor samples, which are then examined using x-ray diffraction, resistivity, FTIR absorption and dielectric measurements. Orthorhombic crystals arrangement have shown by these samples in which unit cell volume (except for Ti-doping of x=0.5), suppresses as the Ti doping level increases in the final compound; in CUo.s Tlo.sBa2CaCu2_x TixOs-o samples an antiferromagnetic order' is most likely broken at the CU02 planar site that induces rise in the unit cell volume. The room temperature resistivity of Cuo sTlo sBa2CaCu2-xTixOs-o (x=O, 0.5, 1, 1.5, 2.0) samples suppresses with rises in Ti-doping. These samples have displayed the zero resistivity critical at 99, 100.3, 100, 99.8, lOOK and onset of superconductive characteristics around 111.3, 110.6, 112, 111.6, 109.5K respectively; which is the one of the remarkable feature of these samples is superconductivity at lOOK in CUo.s Tlo.sBa2CaThOs-o. Further conductivity analyses (FIC-analysis) of these samples' conductivity data have revealed that due to the lower density of mobile carriers at the Cu02/Ti02 planar sites, the parameter values such as ~e(O ), the ~ermi velocity of superconducting carriers, the inter-layer coupling J, and the phase relaxation time of the carriers all decrease. The parameters value such as Be(o), J(;(O) are slightly suppressed whereas the parameters values such as ~ are rise showing reduced population of pinning centers in Ti-doped samples. Increased Ti-doping in the final molecule softens all of the absorption bands associated with the vibrations of different oxygen atoms in FTIR absorption tests. All of these oxygen atoms' vibrational modes are becoming softer, which is related to the Ti(47 9a~1U) atoms' lower mass as compared to Cu (63.546amu). The ac-conductivity of the dielectric constant increases in doped samples, revealing pronounced superconductivity in such samples, while the real part of the dielectric constant is suppressed in dielectric measurements while the imaginary part of it increases, showing more losses in Ti-doped samples.