Cuo.sTlo.sBa2Ca2(Cu3-xCSx)OlO-O (x=0.5,1,1.5,2,2.5,3) Samples and their Superconducting properties

Abstract

The ro le of charge carriers suppliers of alka li metal Cs at the Cu02 planes is investigated by preparing Cuo sTlosBa2Ca2(Cu3-xCsx)OI0-o ( x=0.5,1 ,1.5,2,2.5, 3) superconductor samp les. These samples have shown olthorhombic crystal structure in which volume of the unit ce ll suppresses with the increased Cs-dop ing. A metallic variation of resistivity is a typical feature of these samples in which an enhancement is observed in the critica l temperature with increased Cs doping. The excess conductivity analyses of conductivity data have shown enhancement in coherence length along c-axis ~e(O), the inter-layer coupling J and Fermi ve locity Yr of superconducting carriers and the phase relaxation time 'r(P of the superconducting carriers with increased Cs-doping. In comparison with un-doped Cuo.sTlosBa2Ca2Cu301O-o samp les the va lues of parameters such as Be(o), Bel (0), Be2(0), Je(O) and K=')J~ are suppressed in Cs-doped Cuo.sTlosBa2Ca2(Cu3-xCsx)OI0-o ( x =0.5, 1, 1.5, 2, 2.5, 3) samp les showing suppression in the population of inadvetent defects which act as pinning centers. Oxygen related phonon modes are softened in Cs-doped samples demonstrating intrinsic doping of Cs in the final compound. Dielectric measurements of these samples have shown suppression in the values of the rea l part of die lectric constant 8', imaginary of part of the dielectric co nstant 8" and ac-conductivity O'ae that most like ly arises from the the suppression in the density of ho les due to increased e lectron-ho les recombinations that transform the material to optimal doping regime wh ich result to their higher critical temperature.