Abstract
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 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 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-temperature term in the low-temperature in-plane resistivity. The results could suggest that quasiparticle decoherence extends to dopings well beyond the pseudogap regime.
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The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank B. Arnold and P. Rourke for their contributions to the Bi2201 measurements and J. Tallon for useful discussions. This work was supported by Engineering and Physical Sciences Research Council grants EP/R011141/1, EP/K016709/1 and EP/L015544/1, the Netherlands Organisation for Scientific Research (NWO) grant 16METL01 ‘Strange Metals’ and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 835279-Catch-22). W.T. acknowledges support from the Polish National Agency for Academic Exchange under the ‘Polish Returns 2019’ programme, grant PPN/PPO/2019/1/00014/U/0001. We also acknowledge support from HFML-RU/FOM, HLD-HZDR and LNCMI-CNRS, members of the European Magnetic Field Laboratory (EMFL).
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The project was conceived by A.C., C.P. and N.E.H. Pulsed field measurements on Tl2201 were performed by C.P. and Z.W. at HLD–Dresden and by C.P., S.B., W.T. and J.A. at LNCMI–Toulouse. J.L. and S.L. contributed to the Hall effect measurement on Bi2201 at HMFL–Nijmegen. Samples of Tl2201 were grown by L.M. and J.R.C. Samples of Bi2201 were grown by T.K. and T.T. A.C. performed the numerical simulations of RH(T, H). The manuscript was written by A.C. and N.E.H., with input from all the co-authors.
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Methods including Supplementary Table 1 and Figs. 1–6, description of simulation including Figs. 7 and 8 and comparison to other compounds including Figs. 9 and 10.
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Putzke, C., Benhabib, S., Tabis, W. et al. Reduced Hall carrier density in the overdoped strange metal regime of cuprate superconductors. Nat. Phys. 17, 826–831 (2021). https://doi.org/10.1038/s41567-021-01197-0
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DOI: https://doi.org/10.1038/s41567-021-01197-0
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