Investigation of structural and Magnetic properties of (Nb) Substituted YBCO-system

In this study, we report the synthesis and characterization of YBa۲Cu۳O۷-δ (YBCO) high temperature superconductor prepared by solid state method and doped with Nb in different weight percentages, ۰, ۰.۰۱, ۰.۰۲ and ۰.۰۵ wt%. The x-ray diffraction (XRD) analysis confirms the formation of orthorhombic phase of superconductivity for all the prepared samples. We evaluated the effects of Nb doping on the normal state resistivity (ρ), superconducting transition temperature (Tc), scanning electron microscope (SEM. The critical current densities, JC as a function of temperature have been calculated using the critical state model from the hysteresis loops up to ۱T at temperature range of ۱۰K to ۶۰K. Magnetic flux pinning, FP of samples was calculated by using Lorentz force. XRD analysis show a shorter c axis parameter and higher orthoromthcity than the pure Y-۱۲۳ and other Nb doped samples. It was also found from critical current density and magnetic flux pinning force measurement the ۰.۰۱ wt% Nb substation for Y on YBCO superconductors improve the critical current density and flux pinning force.

کلیدواژه ها:

H-T Superconductors ، X-Ray diffraction ، SEM ، Hysteresis loops ، Critical Current Density and Flux pinning