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Phys Rev Lett. 2011 Jul 8;107(2):027001. Epub 2011 Jul 7.

Electrostatic control of the evolution from a superconducting phase to an insulating phase in ultrathin YBa₂Cu₃O(7-x) films.

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1
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Erratum in

  • Phys Rev Lett. 2011 Jul 15;107(3):039901.

Abstract

The electrical transport properties of ultrathin YBa₂Cu₃O(7-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 22 K 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.

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