Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104518 |
Resumo: | We report on magnetization and magnetoresistance measurements of single-crystal, melt-processed, and polycrystalline YBa2Cu3O7− samples with the purpose of disclosing the connection between the magnetic irreversibility limit and the zero resistance temperature point as a function of applied field in the above samples with very different superconducting granularities. Another goal is to find out how much the applied fields degrade the grain couplings and the electric conductivity for the different field-current configurations. In homogeneous superconductors, the magnetic irreversibility line is well known as a limit below which an electric current different from zero can flow without resistance. Our data for the single crystal with a weak superconducting granularity closely follow this rule. However, the results on the other samples are quite different. Normally, good-quality melt-processed YBa2Cu3O7− samples do not exhibit the signature of superconducting granularity. Nevertheless, x-ray analysis of our melt-processed sample, containing 30 wt % of the Y2BaCuO5 phase, shows considerable misalignment of the crystallite c axis, which weakens the grain couplings and hence is expected to result in superconducting granularity. Effectively, the magnetic irreversibility lines for H c axis as well as for H ab plane exhibit, in the low-field region, the usual signature of superconducting granularity. On the other hand, the zero resistance data for increasing fields along the c axis and J ab plane split away from the irreversibility line toward the lower-temperature side. Nevertheless, for H J ab plane, the zero resistance data closely follow the irreversibility line up to the highest applied fields. In the polycrystalline YBa2Cu3O7− sample, in which the grain junctions are much weaker, the effect of an increasing applied field on the grain couplings is much stronger. The zero resistance line is already split from the irreversibility line and is lower by more than 17 K at 8 kOe. Our present measurements provide good quantitative data for the discrepancy between the zero resistance and magnetic irreversibility lines. We explain these features in terms of the superconducting glass model. |
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Dias, Fabio TeixeiraVieira, Valdemar das NevesRodrigues Junior, PedroObradors, XavierPureur Neto, PauloSchaf, Jacob2014-10-14T02:13:02Z20081098-0121http://hdl.handle.net/10183/104518000637833We report on magnetization and magnetoresistance measurements of single-crystal, melt-processed, and polycrystalline YBa2Cu3O7− samples with the purpose of disclosing the connection between the magnetic irreversibility limit and the zero resistance temperature point as a function of applied field in the above samples with very different superconducting granularities. Another goal is to find out how much the applied fields degrade the grain couplings and the electric conductivity for the different field-current configurations. In homogeneous superconductors, the magnetic irreversibility line is well known as a limit below which an electric current different from zero can flow without resistance. Our data for the single crystal with a weak superconducting granularity closely follow this rule. However, the results on the other samples are quite different. Normally, good-quality melt-processed YBa2Cu3O7− samples do not exhibit the signature of superconducting granularity. Nevertheless, x-ray analysis of our melt-processed sample, containing 30 wt % of the Y2BaCuO5 phase, shows considerable misalignment of the crystallite c axis, which weakens the grain couplings and hence is expected to result in superconducting granularity. Effectively, the magnetic irreversibility lines for H c axis as well as for H ab plane exhibit, in the low-field region, the usual signature of superconducting granularity. On the other hand, the zero resistance data for increasing fields along the c axis and J ab plane split away from the irreversibility line toward the lower-temperature side. Nevertheless, for H J ab plane, the zero resistance data closely follow the irreversibility line up to the highest applied fields. In the polycrystalline YBa2Cu3O7− sample, in which the grain junctions are much weaker, the effect of an increasing applied field on the grain couplings is much stronger. The zero resistance line is already split from the irreversibility line and is lower by more than 17 K at 8 kOe. Our present measurements provide good quantitative data for the discrepancy between the zero resistance and magnetic irreversibility lines. We explain these features in terms of the superconducting glass model.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 77, no. 13 (Apr. 2008), 134503, 8p.Supercondutores tipo IIMagnetorresistênciaIrreversibilidadeSupercondutores granularesCorrelation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductorsEstrangeiroinfo: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:UFRGSORIGINAL000637833.pdf000637833.pdfTexto completo (inglês)application/pdf685370http://www.lume.ufrgs.br/bitstream/10183/104518/1/000637833.pdf1901bdca8c125840162d248c0979d60eMD51TEXT000637833.pdf.txt000637833.pdf.txtExtracted Texttext/plain40354http://www.lume.ufrgs.br/bitstream/10183/104518/2/000637833.pdf.txtdaf7141977529ee1ab34c2cf3dae3a00MD52THUMBNAIL000637833.pdf.jpg000637833.pdf.jpgGenerated Thumbnailimage/jpeg1995http://www.lume.ufrgs.br/bitstream/10183/104518/3/000637833.pdf.jpg14276c66048fb72044cb69fa013aa262MD5310183/1045182024-05-23 06:43:07.438807oai:www.lume.ufrgs.br:10183/104518Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-05-23T09:43:07Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
title |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
spellingShingle |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors Dias, Fabio Teixeira Supercondutores tipo II Magnetorresistência Irreversibilidade Supercondutores granulares |
title_short |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
title_full |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
title_fullStr |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
title_full_unstemmed |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
title_sort |
Correlation between the magnetic irreversibility limit and the zero resistance point in different granular YBa/sub 2/Cu/sub 3/O/sub 7-σ superconductors |
author |
Dias, Fabio Teixeira |
author_facet |
Dias, Fabio Teixeira Vieira, Valdemar das Neves Rodrigues Junior, Pedro Obradors, Xavier Pureur Neto, Paulo Schaf, Jacob |
author_role |
author |
author2 |
Vieira, Valdemar das Neves Rodrigues Junior, Pedro Obradors, Xavier Pureur Neto, Paulo Schaf, Jacob |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Dias, Fabio Teixeira Vieira, Valdemar das Neves Rodrigues Junior, Pedro Obradors, Xavier Pureur Neto, Paulo Schaf, Jacob |
dc.subject.por.fl_str_mv |
Supercondutores tipo II Magnetorresistência Irreversibilidade Supercondutores granulares |
topic |
Supercondutores tipo II Magnetorresistência Irreversibilidade Supercondutores granulares |
description |
We report on magnetization and magnetoresistance measurements of single-crystal, melt-processed, and polycrystalline YBa2Cu3O7− samples with the purpose of disclosing the connection between the magnetic irreversibility limit and the zero resistance temperature point as a function of applied field in the above samples with very different superconducting granularities. Another goal is to find out how much the applied fields degrade the grain couplings and the electric conductivity for the different field-current configurations. In homogeneous superconductors, the magnetic irreversibility line is well known as a limit below which an electric current different from zero can flow without resistance. Our data for the single crystal with a weak superconducting granularity closely follow this rule. However, the results on the other samples are quite different. Normally, good-quality melt-processed YBa2Cu3O7− samples do not exhibit the signature of superconducting granularity. Nevertheless, x-ray analysis of our melt-processed sample, containing 30 wt % of the Y2BaCuO5 phase, shows considerable misalignment of the crystallite c axis, which weakens the grain couplings and hence is expected to result in superconducting granularity. Effectively, the magnetic irreversibility lines for H c axis as well as for H ab plane exhibit, in the low-field region, the usual signature of superconducting granularity. On the other hand, the zero resistance data for increasing fields along the c axis and J ab plane split away from the irreversibility line toward the lower-temperature side. Nevertheless, for H J ab plane, the zero resistance data closely follow the irreversibility line up to the highest applied fields. In the polycrystalline YBa2Cu3O7− sample, in which the grain junctions are much weaker, the effect of an increasing applied field on the grain couplings is much stronger. The zero resistance line is already split from the irreversibility line and is lower by more than 17 K at 8 kOe. Our present measurements provide good quantitative data for the discrepancy between the zero resistance and magnetic irreversibility lines. We explain these features in terms of the superconducting glass model. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008 |
dc.date.accessioned.fl_str_mv |
2014-10-14T02:13:02Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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article |
status_str |
publishedVersion |
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http://hdl.handle.net/10183/104518 |
dc.identifier.issn.pt_BR.fl_str_mv |
1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000637833 |
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1098-0121 000637833 |
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http://hdl.handle.net/10183/104518 |
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. 77, no. 13 (Apr. 2008), 134503, 8p. |
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