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Thermodynamics of $T_{\rm c}$ suppression in far-overdoped Tl$_2$Ba$_2$CuO$_6$

Year: 2026
Type: preprint
Abstract: The physical origin of the suppression of superconductivity with hole doping in overdoped cuprates remains unclear. We measure the electronic specific heat of microgram-scale Tl$_2$Ba$_2$CuO$_6$ crystals and find sharp superconducting anomalies persisting far into the overdoped regime. A weak-coupling BCS-like framework incorporating the known Fermi surface and cation disorder quantitatively reproduces the observed anomalies for $T_{\rm c}=14$-$25$ K and their weak doping dependence. The results show $T_{\rm c}(p)$ to be driven predominantly by a smoothly decreasing pairing strength.
DOI: 10.48550/arxiv.2609.01213
Authors: Maiti, Ayanesh, Broun, David M., Khim, Seunghyun, Moravec, Michal, Carrington, Antony, Putzke, Carsten, Mishra, Vivek, Hirschfeld, Peter, Mackenzie, Andrew P., Rost, Andreas W.
Institutions: Simon Fraser University, Max Planck Institute for Chemical Physics of Solids, University of Bristol, Max Planck Institute for the Structure and Dynamics of Matter, University of Florida, University of St Andrews
Language: English
Open Access status: green
Funders: National Science Foundation, Deutsche Forschungsgemeinschaft, Max-Planck-Gesellschaft, International Max Planck Research School for Advanced Methods in Process and Systems Engineering, International Max Planck Research School for Chemistry and Physics of Quantum Materials, Natural Sciences and Engineering Research Council of Canada, Engineering and Physical Sciences Research Council, Division of Materials Research
OpenAlex ID: W7206203037
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