Abstract
In high- ${T}_{c}$ superconducting ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ films and at no applied magnetic field we found both positive and negative in-plane nonlocal resistance in the vicinity of a vortex-antivortex unbinding transition, as it was predicted recently. The sign of the nonlocal resistance depends on the probed region in the current-temperature diagram. Our results indicate that a negative nonlocal resistance is due to the motion of unbounded vortex-antivortex (V-A), whereas a positive sign is attributed to the motion of a 2D V-A ordered lattice.
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