SUPERCONDUCTIVITY OF NIOBIUM FILMS

被引:46
作者
ASADA, Y
NOSE, H
机构
[1] National Research Institute for Metals, Nakameguro, Meguro-ku, Tokyo
关键词
D O I
10.1143/JPSJ.26.347
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 Hc⫽ is explained by the temperature dependence of the coherence length ξ(t). The perpendicular critical field Hc┴ varies as 1—t independently of their thickness. The coherence length ξ(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 Hc⫽/Hc┴ becomes lower than 1.69 are discussed by considering the isolated columnar structure. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.
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页码:347 / +
页数:1
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