Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors
Autor(a) principal: | |
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Data de Publicação: | 1997 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104157 |
Resumo: | Systematic conductivity measurements near Tc in granular (Bi,Pb)-Sr-Ca-Cu-O superconductors are presented, and focus is given on the interplay between thermal fluctuations and disorder at micro- and mesoscopic levels. Experiments show that the resistive transition is a two-step process. In the normal phase, Gaussian and critical fluctuation conductivity regimes were identified. Both are affected by local disorder. Particularly, the critical regime is characterized by a power law with exponent λcr~3, which we interpret as resulting from microscopic granularity. Below Tc and in the regime describing the approach to the zero-resistance state, fluctuation conductivity diverges as expected in a paracoherent-coherent transition of a mesoscopic granular superconductor. The results show that, instead of trivially rounding the transition, disorder at micro- and mesoscopic levels preserves a true critical phenomenology in granular superconductors. |
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Jurelo, Alcione RobertoKunzler, Julio VitorSchaf, JacobPureur Neto, PauloRosenblatt, Jorge2014-10-04T02:13:15Z19970163-1829http://hdl.handle.net/10183/104157000157713Systematic conductivity measurements near Tc in granular (Bi,Pb)-Sr-Ca-Cu-O superconductors are presented, and focus is given on the interplay between thermal fluctuations and disorder at micro- and mesoscopic levels. Experiments show that the resistive transition is a two-step process. In the normal phase, Gaussian and critical fluctuation conductivity regimes were identified. Both are affected by local disorder. Particularly, the critical regime is characterized by a power law with exponent λcr~3, which we interpret as resulting from microscopic granularity. Below Tc and in the regime describing the approach to the zero-resistance state, fluctuation conductivity diverges as expected in a paracoherent-coherent transition of a mesoscopic granular superconductor. The results show that, instead of trivially rounding the transition, disorder at micro- and mesoscopic levels preserves a true critical phenomenology in granular superconductors.application/pdfengPhysical review. B, Condensed matter. New York. Vol. 56, no. 22 (Dec. 1997), p. 14815-14821Física da matéria condensadaSupercondutoresSupercondutividadeFluctuation conductivity and microscopic granularity in bi-based high-temperature 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:UFRGSORIGINAL000157713.pdf000157713.pdfTexto completo (inglês)application/pdf111221http://www.lume.ufrgs.br/bitstream/10183/104157/1/000157713.pdfd86c0ad5e1416e009819cd0b777de2a8MD51TEXT000157713.pdf.txt000157713.pdf.txtExtracted Texttext/plain35667http://www.lume.ufrgs.br/bitstream/10183/104157/2/000157713.pdf.txtc85d65380f90cd208057588040227e6cMD52THUMBNAIL000157713.pdf.jpg000157713.pdf.jpgGenerated Thumbnailimage/jpeg2062http://www.lume.ufrgs.br/bitstream/10183/104157/3/000157713.pdf.jpg7b9a5f34fb4089223d4485669c9735dfMD5310183/1041572018-10-08 08:57:00.406oai:www.lume.ufrgs.br:10183/104157Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T11:57Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
title |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
spellingShingle |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors Jurelo, Alcione Roberto Física da matéria condensada Supercondutores Supercondutividade |
title_short |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
title_full |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
title_fullStr |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
title_full_unstemmed |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
title_sort |
Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors |
author |
Jurelo, Alcione Roberto |
author_facet |
Jurelo, Alcione Roberto Kunzler, Julio Vitor Schaf, Jacob Pureur Neto, Paulo Rosenblatt, Jorge |
author_role |
author |
author2 |
Kunzler, Julio Vitor Schaf, Jacob Pureur Neto, Paulo Rosenblatt, Jorge |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Jurelo, Alcione Roberto Kunzler, Julio Vitor Schaf, Jacob Pureur Neto, Paulo Rosenblatt, Jorge |
dc.subject.por.fl_str_mv |
Física da matéria condensada Supercondutores Supercondutividade |
topic |
Física da matéria condensada Supercondutores Supercondutividade |
description |
Systematic conductivity measurements near Tc in granular (Bi,Pb)-Sr-Ca-Cu-O superconductors are presented, and focus is given on the interplay between thermal fluctuations and disorder at micro- and mesoscopic levels. Experiments show that the resistive transition is a two-step process. In the normal phase, Gaussian and critical fluctuation conductivity regimes were identified. Both are affected by local disorder. Particularly, the critical regime is characterized by a power law with exponent λcr~3, which we interpret as resulting from microscopic granularity. Below Tc and in the regime describing the approach to the zero-resistance state, fluctuation conductivity diverges as expected in a paracoherent-coherent transition of a mesoscopic granular superconductor. The results show that, instead of trivially rounding the transition, disorder at micro- and mesoscopic levels preserves a true critical phenomenology in granular superconductors. |
publishDate |
1997 |
dc.date.issued.fl_str_mv |
1997 |
dc.date.accessioned.fl_str_mv |
2014-10-04T02:13:15Z |
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/10183/104157 |
dc.identifier.issn.pt_BR.fl_str_mv |
0163-1829 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000157713 |
identifier_str_mv |
0163-1829 000157713 |
url |
http://hdl.handle.net/10183/104157 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter. New York. Vol. 56, no. 22 (Dec. 1997), p. 14815-14821 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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