Abstract
Upper critical magnetic fields of the Bi1.6Pb0.4Sr2Ca2Cu2+xOy system with x=0.8, 1.2, 1.6 were measured by a magnetoresistance method using a pulsed magnetic field. The Hc2(0) are estimated to be 45.9, 218 and 64.9 T for x=0.8, 1.2, 1.6, respectively. Hc1(T) for each composition was determined from magnetisation curves. The superconducting parameters xi , kappa and lambda were derived from experimental data. X-ray diffraction patterns show that there is no obvious change in structure. It is suggested that the coordination number of Cu strongly influences the superconductivity.
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