Superconducting transition of Nb-Ti tape studied by transverse voltage method

Abstract We have measured both longitudinal and transverse voltages with respect to current in flat samples of superconducting cold-worked and heat-treated Nb-50wt%Ti tapes. In the vicinity of the Hc2 a transverse voltage is even with respect to the magnetic field inversion. We have found that transverse voltage varies significantly along the sample and depended on the magnitude of exciting current. Moreover, the behavior of the transverse voltage was qualitatively similar for two different orientations of applied field: in the plane of the tape and normal to the tape. The obtained data not only suggest that the main cause of the transverse voltage is material inhomogeneity, but also indicate that the transverse voltage is not described within the framework of the usual understanding of the resistivity appearance as the vortices movement.