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Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures

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dc.contributor.author Gasparov, V.A.
dc.contributor.author Božović, I.
dc.date.accessioned 2018-01-07T17:10:39Z
dc.date.available 2018-01-07T17:10:39Z
dc.date.issued 2015
dc.identifier.citation Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures / V.A. Gasparov, I. Božović // Физика низких температур. — 2015. — Т. 41, № 12. — С. 1237–1242. — Бібліогр.: 34 назв. — англ. uk_UA
dc.identifier.issn 0132-6414
dc.identifier.other PACS: 74.78.Fk, 74.72.Gh, 74.40.−n
dc.identifier.uri http://dspace.nbuv.gov.ua/handle/123456789/128284
dc.description.abstract We used atomic-layer molecular beam epitaxy to synthesize bilayers of a cuprate metal (La₁.₅₅Sr₀.₄₅CuO₄) and a cuprate insulator (La₂CuO₄), in which each layer is just one unit cells thick. We have studied the magnetic field and temperature dependence of the complex sheet conductance, σ(ω), of these films. Experiments have been carried out at frequencies between 2–50 MHz using the single-spiral coil technique. We found that: (i) the inductive response starts at ∆T = 3 K lower temperatures than Re σ(T), which in turn is characterized by a peak close to the transition, (ii) this shift is almost constant with magnetic field up to 14 mT; (iii) ∆T increases sharply up to 4 K at larger fields and becomes constant up to 8 T; (iv) the vortex diffusion constant D(T) is not linear with T at low temperatures as in the case of free vortices, but is rather exponential due to pinning of vortex cores, and (v) the dynamic Berezinski–Kosterlitz–Thouless (BKT) transition temperature occurs at the point where Y = (lω/ξ₊)² = 1. Our experimental results can be described well by the extended dynamic theory of the BKT transition and dynamics of bound vortex–antivortex pairs with short separation lengths. uk_UA
dc.description.sponsorship We are grateful to V.F. Gantmakher and R. Huguenin for helpful discussions. We would like to thank S. Zlobin for experimental aid. This work was supported in part by the Russian Academy of Sciences Program “Quantum mesoscopic and nonhomogeneous systems” and RFFI grant 12-02-00171. The work at Brookhaven National Laboratory was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division. uk_UA
dc.language.iso en uk_UA
dc.publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України uk_UA
dc.relation.ispartof Физика низких температур
dc.subject Свеpхпpоводимость, в том числе высокотемпеpатуpная uk_UA
dc.title Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures uk_UA
dc.type Article uk_UA
dc.status published earlier uk_UA


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