Abstract
We have studied the mixed state Hall effect in YBa2Cu3O7−δ single crystals with unidirectional twins: ϱxy=f(H). An analysis of the Hall conductivity σxy in free flux flow regime reveals that σxy can be successfully described by two terms which are related to the quasiparticle excitations and the motion of free vortices respectively. We have discovered the strong twin dependence of the Hall conductivity σxy in the pinning (TAFF) regime and detected the sign reverse of the Hall conductivity σxy at changing angle α (+45 °→−45 °) between current and twin plane that indicated the presence of backflow of vortices. We have observed that σxy tends to -∞ while approaching the melting line. These results provide the evidence of strong planar pinning influence on the Hall conductivity.
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