Collapse of a transport current in hard superconductors
A phenomenon of compression of a transport current I by an external ac magnetic field in hard superconductors being in the critical state is studied both theoretically and experimentally. This phenomenon occurs in a forceless configuration when the ac field and the transport current are parallel. Th...
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| Дата: | 1995 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1995
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| Назва видання: | Физика низких температур |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/175579 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Collapse of a transport current in hard superconductors / I.V. Baltaga, N.М. Makarov, V.A. Yampolskii, L.M. Fisher, I.F. Voloshin // Физика низких температур. — 1995. — Т. 21, № 4. — С. 411-420. — Бібліогр.: 13 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
irk-123456789-175579 |
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irk-123456789-1755792021-02-02T01:27:44Z Collapse of a transport current in hard superconductors Baltaga, I.V. Makarov, N.М. Yampolskii, V.A. Fisher, L.M. Voloshin, I.F. A phenomenon of compression of a transport current I by an external ac magnetic field in hard superconductors being in the critical state is studied both theoretically and experimentally. This phenomenon occurs in a forceless configuration when the ac field and the transport current are parallel. The collapse takes place owing to forcing out the transport current by shielding currents flowing inside a surface region of a sample. Using the Hall probe we have directly observed such stratification of the currents with different orientations. The transport current tube contracts to the sample axis as the ac amplitude increases and occupies the whole sample core at some threshold amplitude Ht. As a result, the superconductor goes to the resistive state. A dependence of Ht on I is analyzed both theoretically and experimentally. It is shown, that the collapse in superconducting rings is accompanied by complex relaxation processes. The mechanism of decay of the circular current in rings under the action of an ac signal is investigated in detail. An application of the collapse to test the homogeneity of the critical current capability of superconductors is discussed. 1995 Article Collapse of a transport current in hard superconductors / I.V. Baltaga, N.М. Makarov, V.A. Yampolskii, L.M. Fisher, I.F. Voloshin // Физика низких температур. — 1995. — Т. 21, № 4. — С. 411-420. — Бібліогр.: 13 назв. — англ. 0132-6414 http://dspace.nbuv.gov.ua/handle/123456789/175579 538.945 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
A phenomenon of compression of a transport current I by an external ac magnetic field in hard superconductors being in the critical state is studied both theoretically and experimentally. This phenomenon occurs in a forceless configuration when the ac field and the transport current are parallel. The collapse takes place owing to forcing out the transport current by shielding currents flowing inside a surface region of a sample. Using the Hall probe we have directly observed such stratification of the currents with different orientations. The transport current tube contracts to the sample axis as the ac amplitude increases and occupies the whole sample core at some threshold amplitude Ht. As a result, the superconductor goes to the resistive state. A dependence of Ht on I is analyzed both theoretically and experimentally. It is shown, that the collapse in superconducting rings is accompanied by complex relaxation processes. The mechanism of decay of the circular current in rings under the action of an ac signal is investigated in detail. An application of the collapse to test the homogeneity of the critical current capability of superconductors is discussed. |
| format |
Article |
| author |
Baltaga, I.V. Makarov, N.М. Yampolskii, V.A. Fisher, L.M. Voloshin, I.F. |
| spellingShingle |
Baltaga, I.V. Makarov, N.М. Yampolskii, V.A. Fisher, L.M. Voloshin, I.F. Collapse of a transport current in hard superconductors Физика низких температур |
| author_facet |
Baltaga, I.V. Makarov, N.М. Yampolskii, V.A. Fisher, L.M. Voloshin, I.F. |
| author_sort |
Baltaga, I.V. |
| title |
Collapse of a transport current in hard superconductors |
| title_short |
Collapse of a transport current in hard superconductors |
| title_full |
Collapse of a transport current in hard superconductors |
| title_fullStr |
Collapse of a transport current in hard superconductors |
| title_full_unstemmed |
Collapse of a transport current in hard superconductors |
| title_sort |
collapse of a transport current in hard superconductors |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
1995 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/175579 |
| citation_txt |
Collapse of a transport current in hard superconductors / I.V. Baltaga, N.М. Makarov, V.A. Yampolskii, L.M. Fisher, I.F. Voloshin // Физика низких температур. — 1995. — Т. 21, № 4. — С. 411-420. — Бібліогр.: 13 назв. — англ. |
| series |
Физика низких температур |
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2023-10-18T22:39:09Z |
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