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DOE OSTI · 1898613

Universal relation between doping content and normal-state resistance in gate voltage tuned ultrathin Bi 2 Sr 2 CaCu 2 O 8 + x flakes

Wang, Teng·Yu, Aobo·Liu, Yixin·Gu, Genda·Peng, Wei·Di, Zengfeng·Jiang, Da·Mu, Gang
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Abstract

We report gate voltage tunable ultra-thin high-T c cuprates supply a unique platform to investigate the electronic phase diagram and superconductor-insulator transition. One of the challenges in this field is the precise determination of the doping content in the underdoped non-superconducting region. Here we report the discovery of a universal relation between the doping content p and the normal-state resistance at a fixed temperature R(T f ), p = α + β ln[1/R(T f )], in the ultra-thin Bi 2 Sr 2 CaCu 2 O 8+x flakes. The in-depth analysis shows that the evolution of carrier scattering probability with doping content and the change of effective mass caused by superconductor-insulator transition are two key factors leading to this logarithmic relation. Based on our finding, the more precise electronic phase diagram can be established. In addition, the superconductor-insulator transition is verified to be a quantum phase transition using a finite size scaling analysis. The scaling exponent z v is found to have a close correlation with the disorder levels. The present result provides an important foundation to investigate the fascinating electronic states in the ultra-thin cuprates.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYcuprateshigh-temperature superconductorsimpurities in superconductorsresistivity measurementssuperconducting fluctuationssuperconducting phase transitionultrathin films

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Wang, Teng, Yu, Aobo, Liu, Yixin, Gu, Genda, Peng, Wei, Di, Zengfeng, Jiang, Da, Mu, Gang. 2022-09-14. Universal relation between doping content and normal-state resistance in gate voltage tuned ultrathin Bi 2 Sr 2 CaCu 2 O 8 + x flakes. https://doi.org/10.1103/physrevb.106.104509

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