Anomalous Hall effect in superconductors near their critical temperatures.

摘要: Measurements on epitaxial ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ thin films show that the Hall voltage just below superconducting transition temperature has sign opposite to in normal state. This can result either from quasiparticle effects, or unusual vortex motion. Because we observe a similar effect Nb films, argue motion is responsible. A simple interpretation of then requires velocity have component antiparallel transport current. motion, while contrary existing flux flow models, could damping expected superfluid $^{4}\mathrm{He}$.