Thermopower in the strongly overdoped region of single-layer   Bi2Sr2CuO6+d superconductor
  The evolution of the thermoelectric power S(T) with doping, p, of single-layer Bi2Sr2CuO6+d ceramics in the strongly overdoped region is studied in detail. Analysis in term of drag and diffusion contributions indicates a departure of the diffusion from the T-linear metallic behavior. This effect is increased in the strongly overdoped range (p~0.2-0.28) and should reflect the proximity of some topological change. 
Z. Konstantinovic, G. Le Bras, A. Forget, D. Colson, F. Jean, G.   Collin, M. Ocio, C. Ayache