Magnetic field induced finite size effect in type-II superconductors

Magnetic field induced finite size effect in type-II superconductors

We explore the occurrence of a magnetic field induced finite size effect on the specific heat and correlation lengths of anisotropic type-II superconductors near the zero field transition temperature Tc. Since near the zero field transition thermal fluctuations are expected to dominate and with i...

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Видавець:Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
Дата:2006
Автор: Schneider, T.
Формат: Стаття
Мова:English
Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
Назва видання:Физика низких температур
Теми:
Spin Models
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/120201
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Цитувати:Magnetic field induced finite size effect in type-II superconductors / T. Schneider // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 521–527. — Бібліогр.: 62 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
id irk-123456789-120201
record_format dspace
spelling irk-123456789-1202012017-06-12T03:04:24Z Magnetic field induced finite size effect in type-II superconductors Schneider, T. Spin Models We explore the occurrence of a magnetic field induced finite size effect on the specific heat and correlation lengths of anisotropic type-II superconductors near the zero field transition temperature Tc. Since near the zero field transition thermal fluctuations are expected to dominate and with increasing field strength these fluctuations become one dimensional, whereupon the effect of fluctuations increases, it appears unavoidable to account for thermal fluctuations. Invoking the scaling theory of critical phenomena it is shown that the specific heat data of nearly optimally doped YBa₂Cu₃O₇₋δ are inconsistent with the traditional mean-field and lowest Landau level predictions of a continuous superconductor to normal state transition along an upper critical field Hс₂(T). On the contrary, we observe agreement with a magnetic field induced finite size effect, whereupon even the correlation length longitudinal to the applied field H cannot grow beyond the limiting magnetic length LH ∝ 0/H. It arises because with increasing magnetic field the density of vortex lines becomes greater, but this cannot continue indefinitely. LH is then roughly set on the proximity of vortex lines by the overlapping of their cores. Thus, the shift and the rounding of the specific heat peak in an applied field is traced back to a magnetic field induced finite size effect in the correlation length longitudinal to the applied field. 2006 Article Magnetic field induced finite size effect in type-II superconductors / T. Schneider // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 521–527. — Бібліогр.: 62 назв. — англ. 0132-6414 PACS: 05.70.Jk, 74.40.+k http://dspace.nbuv.gov.ua/handle/123456789/120201 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 Spin Models
Spin Models
spellingShingle Spin Models
Spin Models
Schneider, T.
Magnetic field induced finite size effect in type-II superconductors
Физика низких температур
description We explore the occurrence of a magnetic field induced finite size effect on the specific heat and correlation lengths of anisotropic type-II superconductors near the zero field transition temperature Tc. Since near the zero field transition thermal fluctuations are expected to dominate and with increasing field strength these fluctuations become one dimensional, whereupon the effect of fluctuations increases, it appears unavoidable to account for thermal fluctuations. Invoking the scaling theory of critical phenomena it is shown that the specific heat data of nearly optimally doped YBa₂Cu₃O₇₋δ are inconsistent with the traditional mean-field and lowest Landau level predictions of a continuous superconductor to normal state transition along an upper critical field Hс₂(T). On the contrary, we observe agreement with a magnetic field induced finite size effect, whereupon even the correlation length longitudinal to the applied field H cannot grow beyond the limiting magnetic length LH ∝ 0/H. It arises because with increasing magnetic field the density of vortex lines becomes greater, but this cannot continue indefinitely. LH is then roughly set on the proximity of vortex lines by the overlapping of their cores. Thus, the shift and the rounding of the specific heat peak in an applied field is traced back to a magnetic field induced finite size effect in the correlation length longitudinal to the applied field.
format Article
author Schneider, T.
author_facet Schneider, T.
author_sort Schneider, T.
title Magnetic field induced finite size effect in type-II superconductors
title_short Magnetic field induced finite size effect in type-II superconductors
title_full Magnetic field induced finite size effect in type-II superconductors
title_fullStr Magnetic field induced finite size effect in type-II superconductors
title_full_unstemmed Magnetic field induced finite size effect in type-II superconductors
title_sort magnetic field induced finite size effect in type-ii superconductors
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 2006
topic_facet Spin Models
url http://dspace.nbuv.gov.ua/handle/123456789/120201
citation_txt Magnetic field induced finite size effect in type-II superconductors / T. Schneider // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 521–527. — Бібліогр.: 62 назв. — англ.
series Физика низких температур
work_keys_str_mv AT schneidert magneticfieldinducedfinitesizeeffectintypeiisuperconductors
first_indexed 2023-10-18T20:36:30Z
last_indexed 2023-10-18T20:36:30Z
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