Superconductivity in NbGe2 and isostructural C-40 compounds

The superconductivity of NbGe2 and isostructural C-40 has been studied in a quantitative manner. The high transition temp. (Tc = 16 deg K) exhibited by sputtered films of NbGe2 are to be an intrinsic property of the compound and are attributed to the degree of order produced during the formation pro...

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Bibliographic Details
Published in:Journal of low temperature physics 1979-10, Vol.37 (1-2), p.189-218
Main Authors: Knoedler, C. M., Douglass, D. H.
Format: Article
Language:English
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Summary:The superconductivity of NbGe2 and isostructural C-40 has been studied in a quantitative manner. The high transition temp. (Tc = 16 deg K) exhibited by sputtered films of NbGe2 are to be an intrinsic property of the compound and are attributed to the degree of order produced during the formation process. The roles of excess Ge and thermal effects are also discussed for NbGe2. One of the major conclusions established in this study is that a new crystal structure type, namely the hexagonal C-40 system, is superconducting. Four binary compounds are shown to exhibit superconductivity; they are NbGe2 (Tc = 16 deg K), NbSi2 (Tc = 2.9 deg K), (Tc = 4.4 deg K), and TaGe2 (Tc = 2.7 deg K). Even superconductivity has been demonstrated on these compounds, the mechanism responsible for the superconductivity has not been established.40 refs.--AA
ISSN:0022-2291
1573-7357
DOI:10.1007/BF00114067