Efforts to understand the microscopic origin of superconductivity in the cuprates are dependent on knowledge of the normal state. The Hall number in the low temperature, high field limit nH(0) has a particular significance because within conventional transport theory it is simply related to the number of charge carriers, and so its evolution with doping gives crucial information about the nature of the charge transport. Here we report a study of the high field Hall coefficient of the single layer cuprates Tl2Ba2CuO6+δ (Tl2201) and (Pb/La) doped Bi2Sr2CuO6+δ (Bi2201) which shows how nH(0) evolves in the overdoped, so-called strange metal, regime of cuprates. We find that nH(0) increases smoothly from p to 1 + p, where p is the number of holes doped into the parent insulating state, over a wide range of doping. 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.
|Publication status||Accepted/In press - 5 Feb 2021|