Superconductor-insulator transition in space charge doped one unit cell Bi2.1Sr1.9CaCu2O8+x - Sorbonne Université
Journal Articles Nature Communications Year : 2021

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

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 Bi 2.1 Sr 1.9 CaCu 2 O 8+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.
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Dates and versions

hal-03231139 , version 1 (20-05-2021)

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Cite

Fang Wang, Johan Biscaras, Andreas Erb, Abhay Shukla. Superconductor-insulator transition in space charge doped one unit cell Bi2.1Sr1.9CaCu2O8+x. Nature Communications, 2021, 12, pp.2926. ⟨10.1038/s41467-021-23183-z⟩. ⟨hal-03231139⟩
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