Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/103848 |
Resumo: | We report on very detailed zero-field-cooling and field-cooling magnetization and magnetoresistance measurements in a polycrystalline Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oy superconductor. The results allow us to study the irreversibility line as a function of the magnetic field and temperature. The resistive transition in low fields occurs visibly in two stages, characterizing a granular superconductor. The magnetic irreversibility line as a function of applied field, Tirr(H), reveals a flux dynamics with several regimes. In fields below 0.3 kOe, the Tirr(H) data define an usual de Almeida–Thouless–like line. However, for fields above this value Tirr(H) splits up into two lines of quite different slopes, evidencing a two-step reduction of the flux mobility with decreasing temperatures. We discuss this double onset of irreversibilities in terms of the separated suppression of the transverse and longitudinal fluctuations of the Josephson flux lines. Lacking a specific theoretical approach able to account for the two-step character of the Tirr(H) data, we emphasize its striking analogy with the magnetic irreversibility of CuMn spin glasses and tentatively attribute the upper-temperature line to suppression of the transverse flux mobility along a Gabay-Toulouse-like line and the lower-temperature line to suppression of the longitudinal flux fluctuations along a second de Almeida–Thouless–like line. We suggest that the superconducting glass model including effects from the grain charging energy might be useful to describe these results. We also study the reversible regime of the magnetization above Tirr(H) and up to the bulk critical temperature. These results may be interpreted within the three-dimensional XY model for superconducting thermal fluctuations. |
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Jurelo, Alcione RobertoPureur Neto, PauloSchaf, Jacob2014-09-26T02:10:51Z20011098-0121http://hdl.handle.net/10183/103848000305820We report on very detailed zero-field-cooling and field-cooling magnetization and magnetoresistance measurements in a polycrystalline Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oy superconductor. The results allow us to study the irreversibility line as a function of the magnetic field and temperature. The resistive transition in low fields occurs visibly in two stages, characterizing a granular superconductor. The magnetic irreversibility line as a function of applied field, Tirr(H), reveals a flux dynamics with several regimes. In fields below 0.3 kOe, the Tirr(H) data define an usual de Almeida–Thouless–like line. However, for fields above this value Tirr(H) splits up into two lines of quite different slopes, evidencing a two-step reduction of the flux mobility with decreasing temperatures. We discuss this double onset of irreversibilities in terms of the separated suppression of the transverse and longitudinal fluctuations of the Josephson flux lines. Lacking a specific theoretical approach able to account for the two-step character of the Tirr(H) data, we emphasize its striking analogy with the magnetic irreversibility of CuMn spin glasses and tentatively attribute the upper-temperature line to suppression of the transverse flux mobility along a Gabay-Toulouse-like line and the lower-temperature line to suppression of the longitudinal flux fluctuations along a second de Almeida–Thouless–like line. We suggest that the superconducting glass model including effects from the grain charging energy might be useful to describe these results. We also study the reversible regime of the magnetization above Tirr(H) and up to the bulk critical temperature. These results may be interpreted within the three-dimensional XY model for superconducting thermal fluctuations.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 64, no. 17 (Nov. 2001), 174502, 8 p.Compostos de cálcioFlutuacoes em supercondutoresSupercondutores de alta temperaturaEfeito josephsonMagnetorresistênciaVidros de spinCompostos de estrôncioSeparated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductorEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000305820.pdf000305820.pdfTexto completo (inglês)application/pdf164321http://www.lume.ufrgs.br/bitstream/10183/103848/1/000305820.pdf5e9cfafa34e24732e0d1aaf492a8ee7aMD51TEXT000305820.pdf.txt000305820.pdf.txtExtracted Texttext/plain38767http://www.lume.ufrgs.br/bitstream/10183/103848/2/000305820.pdf.txt2d23942600ba6f36e3b44548f0782157MD52THUMBNAIL000305820.pdf.jpg000305820.pdf.jpgGenerated Thumbnailimage/jpeg1953http://www.lume.ufrgs.br/bitstream/10183/103848/3/000305820.pdf.jpg72cdc5017675eccded7462a99d57f882MD5310183/1038482018-10-08 08:14:14.27oai:www.lume.ufrgs.br:10183/103848Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T11:14:14Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
title |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
spellingShingle |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor Jurelo, Alcione Roberto Compostos de cálcio Flutuacoes em supercondutores Supercondutores de alta temperatura Efeito josephson Magnetorresistência Vidros de spin Compostos de estrôncio |
title_short |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
title_full |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
title_fullStr |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
title_full_unstemmed |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
title_sort |
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor |
author |
Jurelo, Alcione Roberto |
author_facet |
Jurelo, Alcione Roberto Pureur Neto, Paulo Schaf, Jacob |
author_role |
author |
author2 |
Pureur Neto, Paulo Schaf, Jacob |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Jurelo, Alcione Roberto Pureur Neto, Paulo Schaf, Jacob |
dc.subject.por.fl_str_mv |
Compostos de cálcio Flutuacoes em supercondutores Supercondutores de alta temperatura Efeito josephson Magnetorresistência Vidros de spin Compostos de estrôncio |
topic |
Compostos de cálcio Flutuacoes em supercondutores Supercondutores de alta temperatura Efeito josephson Magnetorresistência Vidros de spin Compostos de estrôncio |
description |
We report on very detailed zero-field-cooling and field-cooling magnetization and magnetoresistance measurements in a polycrystalline Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oy superconductor. The results allow us to study the irreversibility line as a function of the magnetic field and temperature. The resistive transition in low fields occurs visibly in two stages, characterizing a granular superconductor. The magnetic irreversibility line as a function of applied field, Tirr(H), reveals a flux dynamics with several regimes. In fields below 0.3 kOe, the Tirr(H) data define an usual de Almeida–Thouless–like line. However, for fields above this value Tirr(H) splits up into two lines of quite different slopes, evidencing a two-step reduction of the flux mobility with decreasing temperatures. We discuss this double onset of irreversibilities in terms of the separated suppression of the transverse and longitudinal fluctuations of the Josephson flux lines. Lacking a specific theoretical approach able to account for the two-step character of the Tirr(H) data, we emphasize its striking analogy with the magnetic irreversibility of CuMn spin glasses and tentatively attribute the upper-temperature line to suppression of the transverse flux mobility along a Gabay-Toulouse-like line and the lower-temperature line to suppression of the longitudinal flux fluctuations along a second de Almeida–Thouless–like line. We suggest that the superconducting glass model including effects from the grain charging energy might be useful to describe these results. We also study the reversible regime of the magnetization above Tirr(H) and up to the bulk critical temperature. These results may be interpreted within the three-dimensional XY model for superconducting thermal fluctuations. |
publishDate |
2001 |
dc.date.issued.fl_str_mv |
2001 |
dc.date.accessioned.fl_str_mv |
2014-09-26T02:10:51Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/103848 |
dc.identifier.issn.pt_BR.fl_str_mv |
1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000305820 |
identifier_str_mv |
1098-0121 000305820 |
url |
http://hdl.handle.net/10183/103848 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 64, no. 17 (Nov. 2001), 174502, 8 p. |
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openAccess |
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