Critical and gaussian conductivity fluctuations in yba2cu3o7-delta
dc.contributor.author | Pureur Neto, Paulo | pt_BR |
dc.contributor.author | Costa, Rosangela Menegotto | pt_BR |
dc.contributor.author | Rodrigues Junior, Pedro | pt_BR |
dc.contributor.author | Schaf, Jacob | pt_BR |
dc.contributor.author | Kunzler, Julio Vitor | pt_BR |
dc.date.accessioned | 2014-10-07T02:11:28Z | pt_BR |
dc.date.issued | 1993 | pt_BR |
dc.identifier.issn | 0163-1829 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104229 | pt_BR |
dc.description.abstract | We report on systematic conductivity fluctuation measurements on three different samp1es of YBa2Cu30 7 - δ • We show, using the temperature derivative of the resistivity and the logarithmic derivative ofthe conductivity with respect to temperature, that the transition is a two-step process. In the normal phase, contributions from Gaussian and criticai ftuctuations are c1early evidenced. Far from Tc the Gaussian exponents indicate that a fractal topology might be adequate to describe the space dimensionality of the ftuctuation spectrum. Closer to Te we observe a crossover to a three-dimensional (3D) homogeneous Gaussian regime. Still closer to Tc we unambiguously identify the exponent λcr~O. 33, predicted by the simplest full dynamic scaling theory of criticai superconducting fluctuations. The obtained exponent is consistent with a 3D, two-component, order parameter. Near the zero-resistance state, the temperature dependence of our data is rather consistent with power-law behavior, suggesting the occurrence of a phase-transition phenomenon related to the percolation granular network. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical Review. B, Condensed matter. New York. Vol. 47, no. 17 (May 1993), p. 11420-11425 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Física da matéria condensada | pt_BR |
dc.subject | Propriedades eletrônicas | pt_BR |
dc.subject | Flutuacoes em supercondutores | pt_BR |
dc.title | Critical and gaussian conductivity fluctuations in yba2cu3o7-delta | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000256710 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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