caa a22 4500 445366648 CHVBK 20180317142932.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10909-010-0339-4 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0339-4 Excess Conductivity Analysis of (Cu0.5Tl0.5)-1223 Substituted by Pr and La [Elektronische Daten] [A. Abou-Aly, R. Awad, M. Kamal, M. Anas] Series of superconducting samples of type Cu0.5Tl0,5 Ba2Ca2−y RyCu3O10−δ , where R=Pr and La with 0≤y≤0.20, were prepared in a sealed quartz tube via a single-step solid-state reaction technique. The prepared samples were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), and electron dispersive X-ray (EDX). XRD studies indicated that the tetragonal structure of (Cu0.5Tl0.5)-1223 phase does not change by Pr or La-substitutions whereas the lattice parameters a and c do. The elemental compositions analysis, determined from EDX, indicated that both Pr and La were successfully introduced into the microstructure of (Cu0.5Tl0.5)-1223 phase. The electrical resistivity ρ(T) was measured as a function of temperature using conventional dc four-probe technique. The fluctuation conductivityΔσ, above the superconducting transition temperatureT c, was analyzed as a function of temperature using Aslamazov and Larkin model. It exhibits four different fluctuation regions namely critical (cr), three-dimensional (3D), two-dimensional (2D), and short-wave (sw). The zero-temperature coherence length, effective layer thickness of the two-dimensional system and inter-layer coupling strength were estimated as a function of the substitution-contenty. Furthermore, the thermodynamics critical field, lower critical magnetic field, upper critical magnetic field, critical current density and Fermi energy were calculated from the Ginzburg number. The data indicated that both Pr and La-substitutions have quite similar behaviors. Springer Science+Business Media, LLC, 2011 High- T c superconductors nationallicence (Cu0.5Tl0,5)-1223 nationallicence Thermodynamic properties nationallicence Electronic transport nationallicence X-ray nationallicence Abou-Aly A. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut Awad R. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut Kamal M. Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt aut Anas M. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 163/3-4(2011-05-01), 184-202 0022-2291 163:3-4<184 2011 163 10909 https://doi.org/10.1007/s10909-010-0339-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0339-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abou-Aly A. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut NATIONALLICENCE 700 1- Awad R. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut NATIONALLICENCE 700 1- Kamal M. Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt aut NATIONALLICENCE 700 1- Anas M. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 163/3-4(2011-05-01), 184-202 0022-2291 163:3-4<184 2011 163 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer