Andreev-reflection spectroscopy with superconducting indium — a case study
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Andreev-reflection spectroscopy with superconducting indium — a case study
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| Creator |
Gloos, K.
Tuuli, E. |
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| Subject |
К 75-летию со дня рождения И. К. Янсона
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| Description |
We have investigated Andreev reflection at interfaces between superconducting indium (Tc = 3.4 K) and several normal conducting nonmagnetic metals (palladium, platinum, and silver) down to T = 0.1 K as well as zinc (Tc = 0.87 K) in its normal state at T = 2.5 K. We analyzed the point-contact spectra with the modified onedimensional BTK theory valid for ballistic transport. It includes Dynes’ quasiparticle lifetime as fitting parameter Γ in addition to superconducting energy gap 2Δ and strength Z of the interface barrier. For contact areas from less than 1 nm² to 10000 nm² the BTK Z-parameter was close to 0.5, corresponding to transmission coefficients of about 80%, independent of the normal metal. The very small variation of Z indicates that the interfaces have a negligible dielectric tunneling barrier. Also Fermi surface mismatch does not account for the observed Z. The extracted value Z ≈ 0.5 can be explained by assuming that practically all of our point contacts are in the diffusive regime. |
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| Date |
2017-05-29T13:14:27Z
2017-05-29T13:14:27Z 2013 |
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| Type |
Article
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| Identifier |
Andreev-reflection spectroscopy with superconducting
indium — a case study / K. Gloos, E. Tuuli // Физика низких температур. — 2013. — Т. 39, № 3. — С. 326–334. — Бібліогр.: 51 назв. — англ.
0132-6414 PACS: 85.30.Hi, 73.40.–c, 74.45.+c http://dspace.nbuv.gov.ua/handle/123456789/118224 |
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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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