Browsing Exact and Earth Sciences by Subject "Flutuacoes em supercondutores"
Now showing items 1-5 of 5
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Critical and gaussian conductivity fluctuations in yba2cu3o7-delta
(1993) [Journal article]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 ... -
Fluctuation conductivity of inhomogeneous superconductors : a fractal aggregation model
(1990) [Journal article]Numerical simulations of diffusion processes are performed on fractal aggregates designed to mimic the structure of inhomogeneous granular superconductors. The spectral dimensions obtained yield ftuctuation-conductivity ... -
Fluctuation magnetoconductivity in YBa/sub 2/Cu/sub 3/O/sub 7/ : Gaussian, three-dimensional XY, beyond three-dimensional XY, and lowest-Landau-level scaling
(2001) [Journal article]Systematic measurements of the in-plane fluctuation magnetoconductivity in a YBa₂Cu₃O₇ single crystal are presented. Fields between 0 and 14 T were applied either parallel or perpendicular to the Cu-O atomic planes. The ... -
Pairing transition, coherence transition, and the irreversibility line in granular GdBa/sub 2/Cu/sub 3/O/sub 7-[delta]/
(2000) [Journal article]We report on electrical magnetoconductivity experiments near the superconducting transition of a granular sample of GdBa₂Cu₃O₇₋₈. The measurements were performed in magnetic fields ranging from 0 to 500 Oe applied parallel ... -
Separated suppression of the transverse and longitudinal Josephson flux mobility in a Bi/sub 1.6/Pb/sub 0.4/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ superconductor
(2001) [Journal article]We report on very detailed zero-field-cooling and field-cooling magnetization and magnetoresistance measurements in a polycrystalline Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oy superconductor. The results allow us to study the irreversibility ...