Fluctuation conductivity of polycrystalline ()superconductors
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedade Brasileira de Física
2005
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| _version_ | 1876438921012838400 |
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| author | Alcione Roberto Jurelo |
| author_facet | Alcione Roberto Jurelo |
| contents | Fluctuation conductivity of polycrystalline ()superconductors Alcione Roberto Jurelo Celmir Lupack de Araújo Ezequiel Costa Siqueira Maurício Pereira Cantão Física, Astronomía y Matemáticas We studied the effect of superconducting fluctuations on the electrical conductivity of granular samples of Y1-xPrxBa2Cu3O7-superconductors, with x =0.01, 0.03, 0.05, 0.07 and 0.10. Samples were prepared by the standard solid-state reaction technique, with two different types of calcination process, in air at 900 ° C ( x 0.07 ) and in vacuum at 850 ° C ( 0.05 x 0.10 ). For the samples prepared in air, our results revealed a splitting of the bulk transition, denoted by TC1and TC2, besides the coherence transition. It was observedfluctuation regimes above the highest transition ( TC1 ) and the lowest transition ( TC2 ). For the samples calcinated in vacuum and high concentrations of Pr, changes were observed in the critical region with chemical substitution of the Pr ion for the Y ion. In the regime of approach to the zero resistance state it was observed an occurrence of a coherence transition for all concentrations of praseodymium. 2005 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46435401 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.35 |
| format | Artículo científico |
| id | redalyc_46435401 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Fluctuation conductivity of polycrystalline ()superconductors Alcione Roberto Jurelo Física, Astronomía y Matemáticas Fluctuation conductivity of polycrystalline ()superconductors Alcione Roberto Jurelo Celmir Lupack de Araújo Ezequiel Costa Siqueira Maurício Pereira Cantão Física, Astronomía y Matemáticas We studied the effect of superconducting fluctuations on the electrical conductivity of granular samples of Y1-xPrxBa2Cu3O7-superconductors, with x =0.01, 0.03, 0.05, 0.07 and 0.10. Samples were prepared by the standard solid-state reaction technique, with two different types of calcination process, in air at 900 ° C ( x 0.07 ) and in vacuum at 850 ° C ( 0.05 x 0.10 ). For the samples prepared in air, our results revealed a splitting of the bulk transition, denoted by TC1and TC2, besides the coherence transition. It was observedfluctuation regimes above the highest transition ( TC1 ) and the lowest transition ( TC2 ). For the samples calcinated in vacuum and high concentrations of Pr, changes were observed in the critical region with chemical substitution of the Pr ion for the Y ion. In the regime of approach to the zero resistance state it was observed an occurrence of a coherence transition for all concentrations of praseodymium. 2005 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46435401 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.35 |
| title | Fluctuation conductivity of polycrystalline ()superconductors |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46435401 |