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Electrostatic Modulation of the Superfluid Density in a Ultrathin La2-xSrxCuO4 Film

A. Rufenacht·J. -P. Locquet·J. Fompeyrine·D. Caimi·P. Martinoli
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Abstract

By capacitively charging an underdoped ultrathin La2-xSrxCuO4 film with an electric field applied across a gate insulator with a high dielectric constant, relative changes of the areal superfluid density n_{s\Box}$ of unprecedented strength were observed in measurements of the film kinetic inductance. Although $n_{s\Box}$ appears to be substantially reduced by disorder, the data provide, for the first time on the same sample, direct compelling evidence for the Uemura relation $T_{c} \propto n_{s\Box}(T=0)$ in the underdoped regime of copper-oxide superconductors.

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A. Rufenacht, J. -P. Locquet, J. Fompeyrine, D. Caimi, P. Martinoli. 2006-07-25. Electrostatic Modulation of the Superfluid Density in a Ultrathin La2-xSrxCuO4 Film. https://doi.org/10.1103/physrevlett.96.227002

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