NONSTATIONARY DISSIPATIVE BEHAVIOR OF CUR RENT-CARRYING TYPE-II SUPERCONDUCTORS IN LONGITUDINAL MAGNETIC-FIELD

The current-field diagram of a type-II superconductor resistive state is considered on the basis of exact solutions for helical magnetic vor tices inside superconducting cylinder and plate. A generalized Silsbee rule for the onset of dissipation in external magnetic field parallel to a transport current is stated. A variety of dissipation cycles wit h oscillations of the longitudinal magnetic moment and emf are shown t o be a possibility due to the left-handed spiral instability of longit udinal vortices, especially in low-dimensional cases.