Anisotropy of the mixed-state resistance of Tl2Ba2CaCu2O8 single crystals

The electrical resistance of single crystals of the high-temperature superconductor Tl2Ba2CaCu2O8 has been measured as a function of the angle θ between the direction of the magnetic field and the current-carrying CuO2-planes. The resistance is maximal for θ = 90° (B⟂CuO2-planes) and decreases to a minimum at θ = 0°. For small angles an anomalous enhancement of the resistance is found. While the general shape of the resistance is generated by the motion of “pancake vortices” in the CuO2-planes, the anomaly is due to “Josephson vortices” moving perpendicular to the planes.