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- W2507241055 abstract "Ultrathin Au-Nb films as thin as 0.2 - 10 nm were deposited on clean surfaces of single-crystal silicon in order to investigate interfacial excitonic superconductivity. The samples were classified into two types, Nb-Au/Si and Au-Nb-Au/Si. In the latter -case, the secondary Au film was deposited on the former sample cooled by liquid nitrogen. In the Nb-Au/ Si type of sample, a sheet resistance, Rs at room temperature abruptly increased from 103 nsq-l order to about 105 nsq-l in several days a few months after the sample preparation. Then the sample showed an anomalous decrease of Rs at about 250 K and an approximately null resistance at lower temperatures. This phenomenon was not so stable and was observed only for a few days. The Au-Nb-Au/Si type of sample showed low Rs (10 2103 nsq-l) at room temperature. A decrease and disappearance of Rs were also observed at about 240 K in the sample with comparatively good repro ducibility. These phenomena are discussed qualitatively, based on the excitonic superconductive model for an interface of metal/semiconductor by Allender, Bray, and Bardeen." @default.
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- W2507241055 date "1986-01-01" @default.
- W2507241055 modified "2023-09-23" @default.
- W2507241055 title "ANOMALOUS DECREASE OF RESISTANCE AT 250 K IN ULTRATHIN Au-Nb FILM ON" @default.
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