The theory of the reentrant effect in susceptibility of cylindrical mesoscopic samples
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
The theory of the reentrant effect in susceptibility of cylindrical mesoscopic samples
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| Creator |
Gogadze, G.A.
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| Subject |
Специальный выпуск superconductivity: XX years after the discovery
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| Description |
A theory has been developed to explain the anomalous behavior of the magnetic susceptibility of a normal metal-superconductor (NS) structure in weak magnetic fields at millikelvin temperatures. The effect was discovered experimentally (A.C. Mota et al., Phys. Rev. Lett. 65, 1514 (1990)). In cylindrical superconducting samples covered with a thin normal pure metal layer, the susceptibility exhibited a reentrant effect: it started to increase unexpectedly when the temperature lowered below 100 mK. The effect was observed in mesoscopic NS structures when the N and S metals were in good electric contact. The theory proposed is essentially based on the properties of the Andreev levels in the normal metal. When the magnetic field (or temperature) changes, each of the Andreev levels coincides from time to time with the chemical potential of the metal. As a result, the state of the NS structure experiences strong degeneracy, and the quasiparticle density of states exhibits resonance spikes. This generates a large paramagnetic contribution to the susceptibility, which adds up to the diamagnetic contribution thus leading to the reentrant effect. The explanation proposed was obtained within the model of free electrons. The theory provides a good description for experimental results. |
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| Date |
2017-06-11T12:52:56Z
2017-06-11T12:52:56Z 2006 |
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| Type |
Article
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| Identifier |
The theory of the reentrant effect in susceptibility
of cylindrical mesoscopic samples / G.A. Gogadze // Физика низких температур. — 2006. — Т. 32, № 6. — С. 716–728. — Бібліогр.: 29 назв. — англ.
0132-6414 PACS: 74.50.+r, 74.45.+c http://dspace.nbuv.gov.ua/handle/123456789/120211 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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