Dimensionality and lock-in transition in Tl2Ba2CuO6single crystal

This is the authors' abstract. We don't add key points for this paper.

The lock-in transition on good-quality over-doped Tl 2 Ba 2 CuO 6 single crystal was investigated. The observed sharp drop, a dip and a peak together in the flux flow resistivity ρ(θ) as the magnetic field angle θ with the c -axis approaches 90° have been ascribed to vortex phase transitions of different types. A demonstration of the inadequacy of the two models of the angular dependence of the upper critical fields to explain this phenomenon is presented here.