Superconductor-insulator transition in space charge doped one unit cell Bi2.1Sr1.9CaCu2O8+x

Fang Wang, Johan Biscaras (), Andreas Erb and Abhay Shukla ()
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Fang Wang: Sorbonne Université, CNRS UMR7590, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC
Johan Biscaras: Sorbonne Université, CNRS UMR7590, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC
Andreas Erb: Bayerische Akademie der Wissenschaften
Abhay Shukla: Sorbonne Université, CNRS UMR7590, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract The superconductor-insulator transition in two dimensions is a prototype continuous quantum phase transition at absolute zero, driven by a parameter other than temperature. Here we reveal this transition in one unit-cell Bi2.1Sr1.9CaCu2O8+x by space charge doping, a field effect electrostatic doping technique. We determine the related critical parameters and develop a reliable way to estimate doping in the nonsuperconducting region, a crucial and central problem in these materials. Finite-size scaling analysis yields a critical doping of 0.057 holes/Cu, a critical resistance of ~6.85 kΩ and a scaling exponent product νz ~ 1.57. These results, together with earlier work in other materials, provide a coherent picture of the superconductor-insulator transition and its bosonic nature in the underdoped regime of emerging superconductivity in high critical temperature superconductors.

Date: 2021
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DOI: 10.1038/s41467-021-23183-z

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