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Abstract:
We report measurements of the normal state magnetoresistance (MR) from
30 to 340 K in fields B up to 13 T for single crystals of overdoped
Tl2Ba2CuO6 (T-c less than or equal to 25 K). For out-of-plane current
flow, the transverse MR Delta rho(c)/rho(c) is large and positive. On
rotating B within the a-b plane, Delta rho(c)/rho(c) exhibits a striking
anisotropy with fourfold symmetry. The amplitude of this effect
increases as B-4 and the maximum MR occurs for B along the [110]
crystallographic directions, i.e., at 45 degrees to the Cu-O-Cu bonds.
This the first direct evidence for anisotropy of the in-plane mean free
path in the cuprates.
