Critical and Gaussian conductivity fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:m

Pureur, P.; Costa, Rosângela Menegotto; Rodrigues, Pedro; Schaf, J.; Kunzler, J. V.

doi:10.1103/physrevb.47.11420

Cited by 134 publications

(121 citation statements)

References 28 publications

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“…From panel 3(b) we can observe, above T P1 , a full dynamic regime dominated by genuine critical flucutations labeled by the exponent λ a P1 = 0.35 ± 0.03. The value of the exponent λ a P1 is consistent with the predictions for the 3D-XY universality class [14]. Still closer to T C1 , it is observed a fluctuation regime beyond 3D-XY with an exponent λ b P1 = 0.16 ± 0.03.…”

Section: Critical Fluctuation Regimessupporting

confidence: 74%

“…Another genuinely critical regime represented by the exponent λ P2 = 0.35 ± 0.03 is also visible below T P1 , in the immediate vicinity above T P2 . This regime, that was not observed in the x = 0.00 sample, is in agreement with the predictions of the full dynamic 3D-XY model [14]. The splitting of the pairing transition, verified by observation of critical regimes λ a P1 and λ b P1 (above T P1 ) and λ P2 (below T P1 ), could be produced by the presence of two superconducting phases with different temperature transition induced by microscopic granularity.…”

Section: Critical Fluctuation Regimessupporting

confidence: 74%

“…The value s ∼ 2.9 observed for this sample is according to the expected value for critical conductivity fluctuations in artificially prepared granular arrays, s ∼ = 3 [32]. The same exponent was also observed to characterize the resistive paracoherence-coherence transition of Y-123 ceramics [14,33].…”

Section: Critical Fluctuation Regimesmentioning

confidence: 68%

“…(1) and (2) we obtain Then, it is possible to determine simultaneously T C and λ by plotting χ −1 σ versus T [14]. Performing averages over several measurements, we obtained the mean values of the critical exponents.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…Careful studies of the conductivity in the neighborhood of the critical temperature can yield information about the nature of the superconducting state [14][15][16] as well as on the influence of the granularity at microscopic and mesoscopic levels on the fluctuation regimes [17][18][19]. In this paper, we report on fluctuations conductivity measurements in polycrystalline samples of the Er 1−x Pr x Ba 2 Cu 3 O 7−δ (0 ≤ x ≤ 0.10) superconductor.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of fluctuation conductivity of polycrystalline Er1-xPr xBa2Cu3O7-δsuperconductors

et al. 2009

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In this work we report on conductivity fluctuation measurements in polycrystalline samples of the Er 1−x Pr x Ba 2 Cu3O 7−δ superconductor (x =0.00, 0.05 and 0.10). Samples were prepared by a standard solidstate reaction technique. The results were analyzed in terms of the temperature derivative of the resistivity and of the logarithmic temperature derivative of the conductivity that allowed the identification of power-law divergences of the conductivity. The results show that the transition proceeds in two stages: pairing and coherence transition. Also, our results, from the critical exponent analysis, show a two-peak splitting at pairing transition, indicating possibly a phase separation. On approaching the zero resistance state, our results show a power-law behavior that corresponds to a phase transition from paracoherent to a coherent state of the granular array.

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Section: Critical Fluctuation Regimessupporting

confidence: 74%

Section: Critical Fluctuation Regimessupporting

confidence: 74%

Section: Critical Fluctuation Regimesmentioning

confidence: 68%

Section: Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of fluctuation conductivity of polycrystalline Er1-xPr xBa2Cu3O7-δsuperconductors

et al. 2009

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Gaussian and Three-Dimensional-XY Scalings and Effects of Disorder in the Fluctuation Magnetoconductivity of Polycrystalline DyBa2Cu3O7-δ

Roa-Rojas¹,

Téllez²,

Pureur³

2000

phys. stat. sol. (b)

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Systematic measurements of the fluctuation magnetoconductivity in granular DyBa2Cu3O7–δ in magnetic fields up to 50 kOe are reported. Gaussian and critical scalings are observed in the normal state. In the Gaussian regimes, large intervals corresponding to low‐dimensional fluctuations are evidenced. Below Tc, in the regime describing the approach to the zero‐resistivity state, the fluctuation conductivity diverges as expected in the coherence transition of mesoscopic granular superconductors in low magnetic fields.

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Gaussian and Three-Dimensional-XY Scalings and Effects of Disorder in the Fluctuation Magnetoconductivity of Polycrystalline DyBa2Cu3O7

Roa-Rojas

Téllez

Pureur

2000

phys. stat. sol. (b)

Self Cite

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Systematic measurements of the fluctuation magnetoconductivity in granular DyBa 2 Cu 3 O 7±d in magnetic fields up to 50 kOe are reported. Gaussian and critical scalings are observed in the normal state. In the Gaussian regimes, large intervals corresponding to low-dimensional fluctuations are evidenced. Below T c , in the regime describing the approach to the zero-resistivity state, the fluctuation conductivity diverges as expected in the coherence transition of mesoscopic granular superconductors in low magnetic fields.

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Critical and Gaussian conductivity fluctuations inYBa2Cu3

Cited by 134 publications

References 28 publications

Analysis of fluctuation conductivity of polycrystalline Er1-xPr xBa2Cu3O7-δsuperconductors

Analysis of fluctuation conductivity of polycrystalline Er1-xPr xBa2Cu3O7-δsuperconductors

Gaussian and Three-Dimensional-XY Scalings and Effects of Disorder in the Fluctuation Magnetoconductivity of Polycrystalline DyBa2Cu3O7-δ

Gaussian and Three-Dimensional-XY Scalings and Effects of Disorder in the Fluctuation Magnetoconductivity of Polycrystalline DyBa2Cu3O7

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