Pattern of current flow in nonideal type-II superconductors in longitudinal magnetic fields. I

Abstract

The longitudinal magnetization of a wire of a nonideal type-II superconductor in the presence of a stationary longitudinal magnetic field Ha is seen to oscillate between paramagnetic and diamagnetic as a conduction current is impressed and removed. When a conduction current I near the critical value Ic is present, the longitudinal magnetization is paramagnetic and attains a maximum. With I=0 after passage of a conduction current IÂIc, the longitudinal magnetization is diamagnetic. This diamagnetic magnetization appreciably exceeds the Meissner-effect diamagnetism exhibited by the sample at corresponding fields. This paramagnetism and diamagnetism have been investigated throughout the range 0