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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1231

Title: Superconductivity in a Ge-doped Bi-Pb-Sr-Ca-Cu-O system
Authors: Nkum, R. K.
Datars, W. R.
Issue Date: 7-Sep-2011
Abstract: The effect of the substitution of Ge in the Bi16. Pbo.4Sr2Ca2Cu, _, Gex, Oy, system has been investigated by means of x-ray diffraction and electrical resistivity measurements. The volume fraction of the 2223 phase Is found to decrease with increasing Ge concentration. The lattice parameter c of the 2223 phase decreases slightly with increasing Ge concentration. The onset of the superconducting transition is about 110 K for all samples. The temperature of zero resistivity, however, is suppressed with Go substitution. The superconductivity of the 2212 phase is evident only for x = 0.5. There is evidence of weak links between the grains. The ratio of the extrapolated residual resistivity to the normal-state resistivity Increases with increasing Ge concentration Indicating that the disorder in the system increases with x.
Description: This is Nkum's and Datar's article published
URI: http://hdl.handle.net/123456789/1231
Appears in Collections:College of Science

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