Giant Flux Creep and Irreversibility in an Y-Ba-Cu-O Crystal: An Alternative to the Superconducting-Glass Model

Yeshurun, Y.; Malozemoff, A. P.

doi:10.1103/physrevlett.60.2202

Cited by 1,843 publications

(411 citation statements)

References 17 publications

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“…The films thicker than 30 nm reveal an upturn curvature of B c2 (T). Similar B c2 (T) behavior has been demonstrated by Yeshurun [13] and Tinkham [14] with an exponent of n = 1.5 for 100 µm YBCO crystals. Also Oh et al [9] reported an upturn curvature with n = 1.3 for 1 µm thick epitaxial YBCO films using both a 0.9R n criterion and the critical fluctuation theory.…”

Section: Magnetoresistivity Of Ybco Thin Filmssupporting

confidence: 59%

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Probst

Ilin

Engel

et al. 2012

Physica C: Superconductivity

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Magnetoresistivity of YBa2Cu3O7− films with thicknesses between 7 and 100 nm deposited on CeO2 and PrBa2Cu3O7− buffer layers on sapphire substrate has been measured to analyze the temperature dependence of the second critical magnetic field Bc2. To define Bc2, the mean-field transition temperature Tc was evaluated by fitting the resistive transition in zero magnetic field with the fluctuation conductivity theory of Aslamazov and Larkin. At T → Tc the Bc2(T) dependence shows a crossover from downturn to upturn curvature with the increase in film thickness. AbstractMagnetoresistivity of YBa 2 Cu 3 O 7- ultra-thin films with thicknesses between 7 and 100 nm deposited on sapphire substrate using CeO 2 and PrBa 2 Cu 3 O 7- buffer layers has been measured to analyze temperature dependence of the second critical magnetic field B c2 . B c2 was determined using T c values obtained by fitting of resistivity vs. temperature data with the fluctuation conductivity theory of Aslamazov-Larkin. At T  T c the B c2 (T) dependence shows a crossover from downturn to upturn curvature with the increase of the YBCO film thickness.

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Section: Magnetoresistivity Of Ybco Thin Filmssupporting

confidence: 59%

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Probst

Ilin

Engel

et al. 2012

Physica C: Superconductivity

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“…The vortex dynamics of CBS have been widely studied in theories and experiments [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]. According to the theory, the thermally activated flux flow (TAFF) resistivity is expressed as ρ = (2ν 0 LB/J) exp(−J c0 BV L/T ) sinh(JBV L/T ) [18,19,20,21,22], where ν 0 is an attempt frequency for a flux bundle hopping, L the hopping distance, B the magnetic induction, J the applied current density, J c0 the critical current density in the absence of flux creep, V the bundle volume, and T the temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermally activated energy and critical magnetic fields of SmFeAsO_0.9F_0.1

Zhang¹,

Ren²,

Zhao³

2009

Supercond. Sci. Technol.

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Thermally activated flux flow and vortex glass transition of recently discovered SmFeAsO0.9F0.1 superconductor are studied in magnetic fields up to 9.0 T. The thermally activated energy is analyzed in two analytic methods, of which one is conventional and generally used, while the other is closer to the theoretical description. The thermally activated energy values determined from both methods are discussed and compared. In addition, several critical magnetic fields determined from resistivity measurements are presented and discussed.

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“…The data were analyzed using the power-law (1−T /T c ) n with n 1.5, typical for cuprate HTS. 32 The irreversibility line H irr is located at relatively high magnetic fields. Interestingly, H irr is for H parallel to the ab-plane almost overlapping with the values of the upper critical field H c c2 reported by Fang et al…”

mentioning

confidence: 99%

Anisotropic superconducting properties of single-crystallineFeSe0.5Te0.5

et al. 2010

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Iron-chalcogenide single crystals with the nominal composition FeSe0.5Te0.5 and a transition temperature of Tc14.6 K were synthesized by the Bridgman method. The structural and anisotropic superconducting properties of those crystals were investigated by means of single crystal x-ray and neutron powder diffraction, superconducting quantum interference device and torque magnetometry, and muon-spin rotation (SR). Room temperature neutron powder diffraction reveals that 95% of the crystal volume is of the same tetragonal structure as PbO. The structure refinement yields a stoichiometry of Fe1.045Se0.406Te0.594. Additionally, a minor hexagonal Fe7Se8 impurity phase was identified. The magnetic penetration depth at zero temperature obtained by means of SR was found to be ab(0)=491 (8) PREPRINT (April 7, 2010) Anisotropic Iron-chalcogenide single crystals with the nominal composition FeSe0.5Te0.5 and a transition temperature of Tc 14.6 K were synthesized by the Bridgman method. The structural and anisotropic superconducting properties of those crystals were investigated by means of single crystal X-ray and neutron powder diffraction, SQUID and torque magnetometry, and muon-spin rotation. Room temperature neutron powder diffraction reveals that 95% of the crystal volume is of the same tetragonal structure as PbO. The structure refinement yields a stoichiometry of Fe1.045Se0.406Te0.594. Additionally, a minor hexagonal Fe7Se8 impurity phase was identified. The magnetic penetration depth λ at zero temperature was found to be λ ab (0) = 491(8) nm in the ab-plane and λc(0) = 1320(14) nm along the c-axis. The zero-temperature value of the superfluid density ρs(0) ∝ λ −2 (0) obeys the empirical Uemura relation observed for various unconventional superconductors, including cuprates and ironpnictides. The temperature dependences of both λ ab and λc are well described by a two-gap s+s-wave model with the zero-temperature gap values of ∆S(0) = 0.51(3) meV and ∆L(0) = 2.61(9) meV for the small and the large gap, respectively. The magnetic penetration depth anisotropy parameter γ λ (T ) = λc(T )/λ ab (T ) increases with decreasing temperature, in agreement with γ λ (T ) observed in the iron-pnictide superconductors.superconducting properties of single-crystalline FeSe 0.5 Te 0.

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Giant Flux Creep and Irreversibility in an Y-Ba-Cu-O Crystal: An Alternative to the Superconducting-Glass Model

Cited by 1,843 publications

References 17 publications

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Thermally activated energy and critical magnetic fields of SmFeAsO_0.9F_0.1

Anisotropic superconducting properties of single-crystallineFeSe0.5Te0.5

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Giant Flux Creep and Irreversibility in an Y-Ba-Cu-O Crystal: An Alternative to the Superconducting-Glass Model

Cited by 1,843 publications

References 17 publications

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Magnetoresistivity of thin YBa2Cu3O7−δ films on sapphire substrate

Thermally activated energy and critical magnetic fields of SmFeAsO0.9F0.1

Anisotropic superconducting properties of single-crystallineFeSe0.5Te0.5

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Product

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Thermally activated energy and critical magnetic fields of SmFeAsO_0.9F_0.1