Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors
dc.contributor.author | Jurelo, Alcione Roberto | pt_BR |
dc.contributor.author | Kunzler, Julio Vitor | pt_BR |
dc.contributor.author | Schaf, Jacob | pt_BR |
dc.contributor.author | Pureur Neto, Paulo | pt_BR |
dc.contributor.author | Rosenblatt, Jorge | pt_BR |
dc.date.accessioned | 2014-10-04T02:13:15Z | pt_BR |
dc.date.issued | 1997 | pt_BR |
dc.identifier.issn | 0163-1829 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104157 | pt_BR |
dc.description.abstract | 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. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter. New York. Vol. 56, no. 22 (Dec. 1997), p. 14815-14821 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Física da matéria condensada | pt_BR |
dc.subject | Supercondutores | pt_BR |
dc.subject | Supercondutividade | pt_BR |
dc.title | Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000157713 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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