Electrostatic control of the evolution from a superconducting phase to an insulating phase in ultrathin YBa2Cu3O7-x films

Xiang Leng, Javier Garcia-Barriocanal, Shameek Bose, Yeonbae Lee, A. M. Goldman

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Abstract

The electrical transport properties of ultrathin YBa2Cu 3O7-x films have been modified using an electric double layer transistor configuration employing an ionic liquid. A clear evolution from superconductor to insulator was observed in nominally 7 unit-cell-thick films. Using a finite size scaling analysis, curves of resistance versus temperature, R(T), over the temperature range from 6 to 22K were found to collapse onto a single scaling function, which suggests the presence of a quantum critical point. However, the scaling fails at the lowest temperatures indicating the possible presence of an additional phase between the superconducting and insulating regimes.

Original languageEnglish (US)
Article number027001
JournalPhysical review letters
Volume107
Issue number2
DOIs
StatePublished - Jul 7 2011

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