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Effects of pressure on the fluctuation conductivity of YBa/sub 2/Cu/sub 3/O/sub 7/

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Effects of pressure on the fluctuation conductivity of YBa/sub 2/Cu/sub 3/O/sub 7/

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Título Effects of pressure on the fluctuation conductivity of YBa/sub 2/Cu/sub 3/O/sub 7/
Autor Ferreira, Leticie Mendonca
Pureur Neto, Paulo
Borges, Hortencio A.
Lejay, Pascal
Abstract The effects of hydrostatic pressure up to 1.11 GPa on the in-plane fluctuation conductivity of YBa2Cu3O7−d are investigated. The experiments are focused on the asymptotic region closely above Tc where a threedimensional Gaussian and genuine critical regimes are identified. From the analysis of the Gaussian critical amplitude one deduces that the off-plane coherence length E(0) does not change significantly with pressure in the studied range. At low applied pressures the asymptotic critical exponent indicates the occurrence of a scaling beyond three-dimensional XY. However, at the highest studied pressure, this exponent assumes a value consistent with the predictions of the full-dynamic three-dimensional XY universality class. The width of the critical regime, as measured by the Ginzburg criterium, increases significantly with pressure. This result is related to a pressure-induced reduction of the in-plane coherence length Eab(0).
Contido em Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 69, no. 21 (June 2004), 212505 4p.
Assunto Física
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104299
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