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 conductance, σ(ω), of the...
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| Дата: | 2015 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2015
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/128284 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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| id |
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irk-123456789-1282842018-01-08T03:03:41Z Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures Gasparov, V.A. Božović, I. Свеpхпpоводимость, в том числе высокотемпеpатуpная 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. 2015 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/128284 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Свеpхпpоводимость, в том числе высокотемпеpатуpная Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| spellingShingle |
Свеpхпpоводимость, в том числе высокотемпеpатуpная Свеpхпpоводимость, в том числе высокотемпеpатуpная Gasparov, V.A. Božović, I. Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures 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. |
| format |
Article |
| author |
Gasparov, V.A. Božović, I. |
| author_facet |
Gasparov, V.A. Božović, I. |
| author_sort |
Gasparov, V.A. |
| title |
Complex conductance of ultrathin La₂₋xSrxCuO₄ films and heterostructures |
| title_short |
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_sort |
complex conductance of ultrathin la₂₋xsrxcuo₄ films and heterostructures |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2015 |
| topic_facet |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/128284 |
| 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. |
| series |
Физика низких температур |
| work_keys_str_mv |
AT gasparovva complexconductanceofultrathinla2xsrxcuo4filmsandheterostructures AT bozovici complexconductanceofultrathinla2xsrxcuo4filmsandheterostructures |
| first_indexed |
2023-10-18T20:55:01Z |
| last_indexed |
2023-10-18T20:55:01Z |
| _version_ |
1796151442918080512 |