Vortex motion under the influence of a temperature gradient

We show that fulfillment of the boundary conditions at the core boundary causes, in the presence of a temperature gradient, the Magnus force acting on the vortices together with the well-known thermal force ${\mathbf{F}}_{\mathrm{th}}$=-${\mathit{S}}_{\mathrm{\Phi }}$∇T (${\mathit{S}}_{\mathrm{\Phi }}$ is a transport entropy per vortex unit length). By measuring the thermoelectric power S and the resistivity ρ of the single-crystalline ${\mathrm{Bi}}_2$ ${\mathrm{Sr}}_2$ ${\mathrm{CaCu}}_2$ ${\mathrm{O}}_{\mathit{x}}$ and ${\mathrm{YBa}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ in H⊥ab and H∥ab we observe qualitatively different responses of Abrikosov vortices and Josephson vortices to the temperature gradient and attribute this difference to the absence of the normal cores of Josephson vortices.