Superconducting Tl-Ca-Ba-Cu-O thin films prepared by diffusion of Tl into an excimer laser ablated Ca2Ba2Cu3Ox film

In this paper we present a description of the Nernst electric field E generated by forced flux tube motion due to a temperature gradient backward differenceT. Depending on the value of backward differenceT with respect to a critical gradient backward differenceTcrit, we find for backward differenceT/backward differenceTcritmuch less-than 1 a regime E ∝ backward differenceT, in close analogy to the regime of thermally activated flux flow in transport current measurements (characterized by an electric field proportional to the transport current). The theory for backward differenceT