Recent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster borides

dc.contributor.authorGasparov, V.A.
dc.date.accessioned2017-06-11T18:25:14Z
dc.date.available2017-06-11T18:25:14Z
dc.date.issued2006
dc.description.abstractWe 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.uk_UA
dc.description.sponsorshipWe 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.uk_UA
dc.identifier.citationRecent 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.uk_UA
dc.identifier.issn0132-6414
dc.identifier.otherPACS: 74.25.Nf, 74.72.Bk, 74.70.Ad, 72.15.Gd
dc.identifier.urihttps://nasplib.isofts.kiev.ua/handle/123456789/120350
dc.language.isoenuk_UA
dc.publisherФізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН Україниuk_UA
dc.relation.ispartofФизика низких температур
dc.statuspublished earlieruk_UA
dc.subjectК 100-летию со дня рождения Б.Г. Лазареваuk_UA
dc.titleRecent observation of anomalous superconducting behavior of ultrathin YBCO films and single crystals of cluster boridesuk_UA
dc.typeArticleuk_UA

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