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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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https://hal.sorbonne-universite.fr/hal-03231139
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Submitted on : Thursday, May 20, 2021 - 2:49:58 PM
Last modification on : Friday, May 21, 2021 - 3:39:40 AM

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

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