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

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

2006-03-03

arxiv.org/abs/cond-mat/0603076v2

Phys. Rev. Lett. 96, 227002 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.227002

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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