Electric Charge Modulation of Thin-Film Superconductors
16 March 1987
Trilayer structures comprising a thin-film In/InOx superconductor separated from a metal-gate electrode by an overgrown oxide dielectric are studied to ascertain directly the dependence of superconducting properties on electric charge. Electric-field induced areal charge density perturbations of greater than 10(13) cm(-2) allow a significant modulation of the resistive transition of 50 angstrom thick films with electron volume densities approaching 10(20) cm(-3).