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

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}$ofunprecedentedstrengthwereobservedinmeasurementsofthefilmkineticinductance.Although$n_{s\Box}$appearstobesubstantiallyreducedbydisorder,thedataprovide,forthefirsttimeonthesamesample,directcompellingevidencefortheUemurarelation$T_{c} \propto n_{s\Box}(T=0)$ in the underdoped regime of copper-oxide superconductors.

4 pages, 3 figures

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