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Title: Electrical modulation of superconducting critical temperature in liquid-gated thin niobium films

We demonstrate that the superconducting critical temperature (T{sub c}) of thin niobium films can be electrically modulated in a liquid-gated geometry device. T{sub c} can be suppressed and enhanced by applying positive and negative gate voltage, respectively, in a reversible manner within a range of about 0.1‚ÄČK. At a fixed temperature below T{sub c}, we observed that the superconducting critical current can be modulated by gate voltage. This result suggests a possibility of an electrically controlled switching device operating at or above liquid helium temperature, where superconductivity can be turned on or off solely by the applied gate voltage.
Authors:
 [1] ;  [2] ; ; ;  [1] ; ;  [3]
  1. Korea Research Institute of Standards and Science, Daejeon 305-340 (Korea, Republic of)
  2. (Korea, Republic of)
  3. Division of Physics and Semiconductor Science, Dongguk University, Seoul 100-715 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22304475
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRITICAL CURRENT; CRITICAL TEMPERATURE; ELECTRIC POTENTIAL; EQUIPMENT; LIQUIDS; MODULATION; NIOBIUM; SUPERCONDUCTIVITY; TEMPERATURE RANGE 0000-0013 K; THIN FILMS; TRANSITION TEMPERATURE