DYNAMICS OF JOSEPHSON VORTICES IN A TEMPERATURE-GRADIENT

We have studied the underdamped dynamics of vortices in a long Josephs on junction in the presence of a temperature gradient along the juncti on. The flux-how voltage was found to depend on the mutual orientation of the temperature gradient and the external magnetic held. This effe ct is caused by the difference in viscosity coefficient on the hot and the cold junction sides. The motion of Josephson vortices is simulate d using the perturbed sine-Gordon model with the spatially dependent l oss term. Simulation results are in good agreement with experimental d ata.