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Effect of Yb-substitution on thermally activated flux creep in the Bi2Sr2CaCu2-xYbxOy superconductors

AutorGündoğmus, H.; Özçelik, B.; Sotelo, A.; Madre, M. A.
Fecha de publicación2013
CitaciónACASC 2013
ResumenBi2Sr2Ca1Cu2−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.
DescripciónResumen 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.
URIhttp://hdl.handle.net/10261/122218
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