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Magnetization of Superconducting Ba (Y, Nd, Sm, Gd, Dy., Er, Yb) CuO Systems

The high temperature superconductors Ba(Y, Nd, Sm, Gd, Dy, Er, Yb)CuO were independently made via the solid reaction method, and their magnetizations were measured by using the BTi SQUID susceptometer. My main findings are that the Meissner effect was observed in the range of 78–92K, the fluxoids were found to be trapped during the field cooling case at all temperatures, the transition temperatures Tc were found to be sensitive to the colling rates of samples during their syntheses, and that the majority of samples were found to have layered perovskite X-ray diffraction patterns. The magnetization M(T) can be understood within the frame work of the BCS theory. The 2Δ(0)/kBTc was deduced to be 3 - 4.4. However, I found the magnetic hysteresis present even in low field 30G range at 10K and that M(T) near Tc was sensitive to thermal fluctuations.