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Electric-Field Modulation of Low Electron Density Thin-Film Superconductors
Abstract Past investigations of electric-field modulation of the normal-state and superconducting properties of thin films are reviewed and compared with recent work on amorphous-composite In/InOx thin films with electron carrier density as low as 1020 cm-3. Electric charge induced in the In/InOx films by a capacitatively- coupled gate electrode has a particularly strong influence when the disorder (resistivity) is increased towards a critical value where superconductivity rapidly disappears. The experimentally-measured field-effect mobility, the unperturbed electron density, and the transition temperature are strongly dependent on oxide content, substrate material, and dielectric capping overlayers. The field-effect measurements confirm the importance of electronic states at the metal-dielectric interfaces and enable a description of “interface dominated superconductivity” in this and possibly other low electron density superconductors. Implications for the high T c oxides are also presented.
Electric-Field Modulation of Low Electron Density Thin-Film Superconductors
Abstract Past investigations of electric-field modulation of the normal-state and superconducting properties of thin films are reviewed and compared with recent work on amorphous-composite In/InOx thin films with electron carrier density as low as 1020 cm-3. Electric charge induced in the In/InOx films by a capacitatively- coupled gate electrode has a particularly strong influence when the disorder (resistivity) is increased towards a critical value where superconductivity rapidly disappears. The experimentally-measured field-effect mobility, the unperturbed electron density, and the transition temperature are strongly dependent on oxide content, substrate material, and dielectric capping overlayers. The field-effect measurements confirm the importance of electronic states at the metal-dielectric interfaces and enable a description of “interface dominated superconductivity” in this and possibly other low electron density superconductors. Implications for the high T c oxides are also presented.
Electric-Field Modulation of Low Electron Density Thin-Film Superconductors
Hebard, A. F. (author) / Fiory, A. T. (author)
Novel Superconductivity ; 9-22
1987-01-01
14 pages
Article/Chapter (Book)
Electronic Resource
English
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