Magnetoresistance and Hall effect study of electron- and hole-doped cuprate superconductors

Hall effect measurements on single crystals of the hole-doped systems Y1-xPrxBa2Cu3O7-delta(delta approximate to 0.05) and YBa2Cu3Oy as a function of x and y, respectively, y showed that the Hall conductivity sigma(xy) vs B data in the mixed state could be described by the expression sigma(xy) = C-1/B + C2B, where the two terms are associated with motion of the magnetic vortices and the quasi-particles in the vortex cores, respectively, and the parameters C-1 and C-2 are functions of x, y, and T. Magnetoresistance measurements on epitaxial thin films of the electron-doped superconductor Nd1.85Ce0.15CuO4+/-delta with varying oxygen content in magnetic fields B parallel to c revealed (a) critical scaling of the electrical resistivity data consistent with a vortex-glass transition for a film with an optimum T-c approximate to 22 K and (b) a characteristic anomaly that develops with increasing field for T < 2 K for an over-oxygenated film with T-c approximate to 10 K.