Superconductor-Insulator Transition in Granular Films of Tin
作者： Michio Watanabe , Hiroshi Shimada , Shun-ichi Kobayashi , Youiti Ootuka
DOI: 10.1143/JPSJ.66.1419
关键词: Transition temperature 、 Kosterlitz–Thouless transition 、 Atmospheric temperature range 、 Superconductor Insulator Transition 、 Superconductivity 、 Sheet resistance 、 Electrical resistance and conductance 、 Electrical resistivity and conductivity 、 Materials science 、 Condensed matter physics 、 General Physics and Astronomy
摘要: To study the superconductor-insulator (SI) transition in two-dimensional systems, we measured electrical resistance of Sn granular films with 24 nm grains over a temperature range from 9 K to 50 mK. A distinct SI was observed when normal-conducting sheet R N is increased, showing that neither flat tail nor quasi reentrance intrinsic effect systems. If define as at 77 K, critical c for exists between 6.0 kΩ and 6.9 kΩ. For samples which showed superconductivity low temperatures, analyzed based on vortex Kosterlitz-Thouless (KT) transition. Evaluating extrapolation KT T →0, 6.4 kΩ, very close Q ≡ h /4 e 2 .
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