Search

Resumen del póster presentado a la 7th Asian Conference on Applied Superconductivity and Cryogenics celebrado en Capadocia (Turquia) del 23 al 25 de octubre de 2013., Bi2Sr2Ca1Cu2−xYbxOy (x=0.0, 0.05, 0.1 and 0.25) textured superconductors were prepared by a Laser Floating Zone (LFZ) technique. The X-ray diffraction, DC magnetization and magnetoresistance measurements were studied. All samples consist mainly of the Bi-2212 phase which indicates the performed process is adequate. However, some impurity phases like CaCuO2 were also detected. We have calculated the hole numbers using the relation given by Presland and particle size, Lhkl, using the XRD patterns results.The activation energies, irreversibility fields (Hirr), upper critical fields (Hc2) and coherence lengths at 0K (?(0) ) were calculated from the resistivity versus temperature (R-T) curves, under DC magnetic fields up to 5 T. The thermally activated flux creep model has been studied in order to calculate the flux pinning energies. The results showed that Hc2(0) varied from 132 to 30 T and the flux pinning energies varied from 650 to 400 meV at 0 T, with the content of Yb.

Resumen del trabajo presentado a la: "3rd International Conference on Superconductivity and Magnetism" celebrada en Estambul (Turquia) del 29 de abril al 4 de mayo de 2012., In this study, the samples with nominal composition of Bi2Sr2Ca1Cu2-xYbxO12+δ, where x =0, 0.05, 0.1 and 0.25, are synthesized by using LFZ (Laser Floating Zone) technique. The effects of different Yb doping on the structure have been investigated by electrical resistance, scanning electron micrographs, XRD, mechanical and dc-magnetization techniques. In order to investigate the magnetic effects of different Yb doping on the structure, the magnetization measurements as a function of the magnetic field up to 10 kOe have been carried out. It has been found that with increasing Yb3+ doping for Cu, the physical and superconducting properties of structure gradually spoils. The Jc values of the samples were calculated by using the Bean’s model. It has been found that the Jc values of the samples significantly change, although TC is approximately the same for all the samples., This work was supported by the Research Fund of Cukurova University, Adana, Turkey, under grant contracts no. FEF2011D21.