Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures
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 conductan...
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| Published in: | Физика низких температур |
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| Date: | 2015 |
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| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2015
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/128284 |
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| Cite this: | 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. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862604431311241216 |
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| author | Gasparov, V.A. Božović, I. |
| author_facet | Gasparov, V.A. Božović, I. |
| citation_txt | 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. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | 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.
|
| first_indexed | 2025-11-28T09:28:38Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-128284 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-28T09:28:38Z |
| publishDate | 2015 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Gasparov, V.A. Božović, I. 2018-01-07T17:10:39Z 2018-01-07T17:10:39Z 2015 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. 0132-6414 PACS: 74.78.Fk, 74.72.Gh, 74.40.−n https://nasplib.isofts.kiev.ua/handle/123456789/128284 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. 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. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Свеpхпpоводимость, в том числе высокотемпеpатуpная Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures Article published earlier |
| spellingShingle | Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures Gasparov, V.A. Božović, I. Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| title | Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures |
| title_full | Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures |
| title_fullStr | Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures |
| title_full_unstemmed | Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures |
| title_short | Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures |
| title_sort | complex conductance of ultrathin la₂₋xsrxcuo₄ films and heterostructures |
| topic | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/128284 |
| work_keys_str_mv | AT gasparovva complexconductanceofultrathinla2xsrxcuo4filmsandheterostructures AT bozovici complexconductanceofultrathinla2xsrxcuo4filmsandheterostructures |