Superconductivity of Niobium Films

概要

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Niobium thin films are prepared by evaporation in ultra-high vacuum system with an electron beam and their superconducting properties are examined as a function of film thickness and temperature. An inflection point appearing in the temperature dependence of the parallel critical field H_<c‖> is explained by the temperature dependence of the coherence length ζ(t). The perpendicular critical field H_<c⊥> varies as 1-t independently of their thickness. The coherence length ζ(0) at 0°K of some films are estimated by three methods. Anomalous results that the minimum occurs on the angular dependence of the critical field and the ratio H_<c‖>/H_<c⊥> becomes lower than 1.69 are discussed by considering the isolated columnar structure.
社団法人日本物理学会の論文
1969-02-05