PC5-4-INV

Evolution of the Hall number in the overdoped cuprate Tl2201

Dec.2 14:45-15:15 (Tokyo Time)

*Antony Carrington1

University of Bristol, England1

Within conventional theory, for a single band metal, the Hall number in the low temperature, high Field limit nH(0) is equal to the carrier density. The evolution of nH(0) with hole doping p in YBa2Cu3O6+x shows an apparent rapid transition from nH(0)=p to nH(0)=1+p which has been interpreted as evidencing a reconstruction of the Fermi surface which coincides with the material entering the pseudogap regime. Here I present results for the overdoped cuprate Tl2Ba2CuO6+x (Tl2201) which also shows such a transition but is, in this case , more gradual with nH(0) becoming equal to 1+p only at the edge of the superconducting dome. Furthermore, in Tl2201 this transition does not appear to accompany entry into a pseudogap regime. The evolution of nH correlates with the emergence of the anomalous linear-in-T term in the low-T in-plane resistivity. The results could suggest that quasiparticle decoherence extends to dopings well beyond the pseudogap regime.

Keywords: Normal state properties, pseudogap, Tl2Ba2CuO6+x