Sign change of the flux flow Hall effect in HTSC

Abstract

A novel mechanism for the sign change of the Hall effect in flux flow region is proposed. The difference δ n between the electron density at the center of the vortex core and that far outside the vortex causes the additional contribution to the Hall conductivity δσ xy = - δnec/ B. This contribution can be bigger that the conventional one in the dirty case Δ( T)τ < 1. If the electron density inside the core exceeds the electron density outside the core the double sign change may occur as a function of temperature and magnetic field.