![Surface effects in the magnetisation of superconducting tantalum için kapak resmi Surface effects in the magnetisation of superconducting tantalum için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
Surface effects in the magnetisation of superconducting tantalum
Başlık:
Surface effects in the magnetisation of superconducting tantalum
Yazar:
Green, Ian M., author.
ISBN:
9780438052673
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (176 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: P. Hlawiczka.
Özet:
A study has been made of the magnetisation of tantalum, a type I superconductor, with particular reference to the effect of surface finish. D.c. M-H loops have been recorded at various temperatures on the rod-shaped specimens, and additional information has been obtained from measurements of a.c. field penetration under d.c. bias conditions. Surface finishes studied were ground, machined, polished, etched and sanded. Different finishes resulted in K-H loops of very different shapes, which frequently varied rapidly with temperature. Superconductivity often persisted in magnetic fields well above the thermodynamic critical field. This was due to a surface layer, altered by the above-mentioned surface finishes, which was considerably more deformed and/or impure than the bulk material, and which consequently played a major part influx trapping. A theory is advanced in Chapter based on published information concerning the effect of impurities and cold work on the critical temperature and residual resistivity of tantalum. It predicts a variation of the superconducting-normal transition field H s-n with temperature which is close to that observed in practice. An associated quantity which is predicted, and compared with experiment, is the shape of the M-H loop close to H s-n . Study of these two quantities leads to a qualitative understanding of previously considered M-H loops. There follows an investigation of the causes of flux trapping in tantalum. Finally, a chapter devoted to experiments on the type II metal niobium correlates a.c. and d.c. measurements and stresses the difference between flux trapping in type I and type II materials.
Notlar:
School code: 0547
Tüzel Kişi Ek Girişi:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684413.1) | 684413-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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