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 n_H(0) has a particular importance because, within conventional transport theory, it is simply related to the number of charge carriers, 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 Tl₂Ba₂CuO_6+δ (Tl2201) and (Pb/La)-doped Bi₂Sr₂CuO_6+δ (Bi2201), which shows how n_H(0) evolves in the overdoped—so-called strange metal—regime of cuprates. We find that n_H(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 n_H correlates with the emergence of the anomalous linear-in-temperature term in the low-temperature in-plane resistivity. The results could suggest that quasiparticle decoherence extends to dopings well beyond the pseudogap regime.

了解铜酸盐中超导性的微观起源的努力取决于对正常状态的了解。低温、高场极限n _H (0) 中的霍尔数具有特别重要的意义，因为在传统的传输理论中，它与电荷载流子的数量简单相关，因此它随着掺杂的演变提供了关于电荷传输的性质。在这里，我们报告了单层铜酸盐 Tl ₂ Ba ₂ CuO _{6+ δ} (Tl2201) 和 (Pb/La) 掺杂的 Bi ₂ Sr ₂ CuO _{6+ δ} (Bi2201) 的高场霍尔系数的研究，其中显示如何n _H(0) 在铜酸盐的过度掺杂（所谓的奇异金属）状态中演化。我们发现n _H (0) 从p平滑增加到 1 +  p，其中p是在很宽的掺杂范围内掺杂到母绝缘状态的空穴数。n _H的演变与低温面内电阻率中异常线性温度项的出现相关。结果可能表明准粒子退相干延伸到远远超出赝能隙范围的掺杂。