1997
DOI: 10.1103/physrevb.55.r14745
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Crossover between Aslamazov-Larkin and short-wavelength fluctuation regimes in high-temperature-superconductor conductivity experiments

Abstract: We present paraconductivity (AL) measurements in three different high temperature superconductors: a melt textured Y Ba2Cu3O7 sample, a Bi2Sr2CaCu2O8 epitaxial thin film and a highly textured Bi2Sr2Ca2Cu3O10 tape. The crossovers between different temperature regimes in excess conductivity have been analysed. The Lawrence-Doniach (LD) crossover, which separates the 2D and 3D regimes, shifts from lower to higher temperatures as the compound anisotropy decreases. Once the LD crossover is overcome, the fluctuation… Show more

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Cited by 79 publications
(51 citation statements)
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“…Later on, the penetration depth measurements in Y Ba 2 Cu 3 O 7−δ revealed critical behavior as wide as ±10K from T c , 7 belonging to the universality class 3D XY. More recent measurements of thermal expansivity 8,9 and two-coil inductive measurements 10 have confirmed this wide range of critical fluctuations, while dc fluctuatuation conductivity measurements still claimed very narrow critical regions 11,12,13,14,15,16 . A major problem in the analysis of a dc fluctuation conductivity is to account for the short wavelength cutoff, 5,6,11,15 and energy cutoff 17,18 at higher temperatures.…”
Section: Introductionmentioning
confidence: 92%
See 1 more Smart Citation
“…Later on, the penetration depth measurements in Y Ba 2 Cu 3 O 7−δ revealed critical behavior as wide as ±10K from T c , 7 belonging to the universality class 3D XY. More recent measurements of thermal expansivity 8,9 and two-coil inductive measurements 10 have confirmed this wide range of critical fluctuations, while dc fluctuatuation conductivity measurements still claimed very narrow critical regions 11,12,13,14,15,16 . A major problem in the analysis of a dc fluctuation conductivity is to account for the short wavelength cutoff, 5,6,11,15 and energy cutoff 17,18 at higher temperatures.…”
Section: Introductionmentioning
confidence: 92%
“…6 would acquire slope −6 in the limit of very high temperatures. If the coherence length acquired the Gaussian form (ξ(T )/ξ 0 ) = 1/ √ ǫ at those temperatures, the dc fluctuation conductivity would have the behavior σ dc ∝ 1/ǫ 3 in both, 2D and 3D cases 11,15,27 . However, significant deviations from this behavior have been observed experimentally, and ascribed to the energy cutoff 17,18 .…”
Section: Theoretical Backgroundmentioning
confidence: 99%
“…According to this picture, below the temperature of pair formation the fluctuations would be vortex-driven and should display a KosterlizThouless behavior, with exponential temperature dependences. On the contrary, it seems a well-established experimental fact that the superconducting fluctuations in the more 2D-like systems (essentially all, but the YBCO) display AL power-law behaviors in ε 6,7,8,9,10,11 . Remarkably, in D = 2 the AL theory of paraconductivity does not allow for any fitting parameter besides the experimentally well accessible distance between the 2D layers, which translates the 2D conductivity, with dimensions Ω −1 , in a 3D conductivity with dimensions Ω −1 m −1 .…”
mentioning
confidence: 99%
“…The early work of Freitas et al [29] and Ausloos [30] [29], [35], [36] and this intriguing feature has motivated the analysis presented here.…”
mentioning
confidence: 99%