Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides
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.&...
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| Published in: | Физика низких температур |
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| Date: | 2006 |
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| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2006
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/120350 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | 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. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862553440339623936 |
|---|---|
| author | Gasparov, V.A. |
| author_facet | Gasparov, V.A. |
| citation_txt | 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. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| 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.
|
| first_indexed | 2025-11-25T21:07:27Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-120350 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-25T21:07:27Z |
| publishDate | 2006 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Gasparov, V.A. 2017-06-11T18:25:14Z 2017-06-11T18:25:14Z 2006 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 https://nasplib.isofts.kiev.ua/handle/123456789/120350 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. We are grateful to V.F. Gantmakher, A. Hebard,
 M. Chan, R. Huguenin, C. Lobb, P. Martinoli,
 D. van der Marel, C. Rogers, D.J. Scalapino, J.-M.
 Triscone, T. Venkatesan, X.X. Xi for stimulating
 discussions. This work was partially supported by
 Russian Ministry of Industry, Science and Technology
 (MSh-2169.2003.2) and Russian Academy of Sciences
 Program: New Materials and Structures. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур К 100-летию со дня рождения Б.Г. Лазарева Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides Article published earlier |
| spellingShingle | Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides Gasparov, V.A. К 100-летию со дня рождения Б.Г. Лазарева |
| title | Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides |
| title_full | Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides |
| title_fullStr | Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides |
| title_full_unstemmed | Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides |
| title_short | Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides |
| title_sort | recent observation of anomalous superconducting behavior of ultrathin ybco films and single crystals of cluster borides |
| topic | К 100-летию со дня рождения Б.Г. Лазарева |
| topic_facet | К 100-летию со дня рождения Б.Г. Лазарева |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/120350 |
| work_keys_str_mv | AT gasparovva recentobservationofanomaloussuperconductingbehaviorofultrathinybcofilmsandsinglecrystalsofclusterborides |