Critical Magnetic Fields (H(sub C2), H(sub C1)) and (kappa) in YBa2(Cu0.98M0.02)3O(7+delta), M=Ni, Al, and Cu.

摘要

The upper critical magnetic field H(sub c2) up to 5T and dM(T)/dH(vert bar)(sub H(sub c2)) for aligned powders of pure and Al and Ni substituted YBa2(Cu.98M.02)3O(7+(delta)) are measured magnetically. dH(sub c2)/dT(vert bar)(sub tc) is linear with slopes of (minus)2.2T/K, (minus)2.4T/K and (minus)2.8T/K for the pure, Ni and Al samples respectively. The values of H(sub c1), (kappa), and (Delta)C/T(sub c) were deduced from dM(T)/dH(vert bar)(sub H(sub c2)). 4 refs., 2 figs., 1 tab.