THERMOELECTRIC-POWER ABOVE THE KOSTERLITZ-THOULESS TRANSITION

Thermoelectric transport due to the motion of free unbound vortices ab ove the Kosterlitz-Thouless transition temperature is considered. It i s shown that the Magnus force, which appears under the influence of th e temperature gradient, leads to a nonzero thermopower at a temperatur e above the Kosterlitz-Thouless transition temperature T(KT), but belo w the mean-field (Ginzburg-Landau) critical temperature T(GL). The exp onential inverse-square-root reduced-temperature dependence of the the rmopower above T(KT) is predicted with a consequent broadening of the superconducting transition detected by means of thermopower measuremen ts. The case of the clean superconductor is analyzed.