Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides
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| Creator |
Gasparov, V.A.
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К 100-летию со дня рождения Б.Г. Лазарева
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| Description |
We report the number of deviations from conventional behavior in superconducting properties of ultrathin (1–3 unit-cell (UC)) YBa₀₂Cu₃O₇₋x films sandwiched between semiconducting Pr₀,₆Y₀,₄Ba₂Cu₃O₇₋x layers and for single crystals of cluster superconductor: dodecaboride ZrB₁₂. We have found a quadratic temperature dependence of the kinetic inductance, Lk⁻¹(Т) , at low temperatures independent of frequency, with a break in slope at TBKT dc , the maximum of real part of conductance, ωσ₁(T), and a large shift of the break temperature and the maximum position to higher temperatures with increasing frequency ω. We obtain from these data the universal ratio T /Lk⁻¹ (Tdc ) = 25, 25, and 17 nHK for 1-, 2- and 3-UC films, respectively in close agreement with theoretical prediction for vortex—antivortex unbinding transition. Superfluid density of ZrB₁₂ displays unconventional temperature dependence with pronounced shoulder at T/Tc equal to 0.65. Contrary to conventional theories we found a linear temperature dependence of Hс₂(Т) from Tc down to 0.35 K. We suggest that both λ(T) and Hс₂(Т) dependencies can be explained by a two band BCS model with different superconducting gap and Tc. |
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| Date |
2017-06-11T18:25:14Z
2017-06-11T18:25:14Z 2006 |
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Article
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| Identifier |
Recent observation of anomalous superconducting
behavior of ultrathin YBCO films and single crystals
of cluster borides / V.A. Gasparov // Физика низких температур. — 2006. — Т. 32, № 8-9. — С. 1105–1114. — Бібліогр.: 33 назв. — англ.
0132-6414 PACS: 74.25.Nf, 74.72.Bk, 74.70.Ad, 72.15.Gd http://dspace.nbuv.gov.ua/handle/123456789/120350 |
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en
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Физика низких температур
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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