Abstract
We have measured the nonlocal in-plane resistance in high-Tcsuperconducting Yba2Cu3O7–dfilms. The results obtained in zero magnetic field show a negative nonlocal resistance in the vicinity of the Kosterlitz-Thouless-type vortex-antivortex unbinding transition, as it was predicted recently by Wortis and Huse [Phys. Rev. B54, 12413 (1996)]. We also found that the negative nonlocal resistance takes place within a certain domain of the current-temperature diagram. Our findings indicate that nonlocal measurements in “planar” geometry can be a new method to study vortex dynamics in superconductors.
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