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Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors

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Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors

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Título Fluctuation conductivity and microscopic granularity in bi-based high-temperature superconductors
Autor Jurelo, Alcione Roberto
Kunzler, Julio Vitor
Schaf, Jacob
Pureur Neto, Paulo
Rosenblatt, Jorge
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.
Contido em Physical review. B, Condensed matter. New York. Vol. 56, no. 22 (Dec. 1997), p. 14815-14821
Assunto Fisica da materia condensada
Supercondutividade
Supercondutores
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104157
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