Fluxon pinning in the nodeless pairing state of superconducting YBa2Cu3O7

Fiory, A. T.; Harshman, Dale R.; Jung, J.; Isaac, I.; Kossler, W. J.; Greer, A. J.; Noakes, D. R.; Stronach, C. E.; Köster, E.; Dow, John D.

doi:10.1007/s11664-005-0054-0

Cited by 4 publications

(16 citation statements)

References 36 publications

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“…Equation (12) assumes H << H c2 (T), which is applicable for T C -T > 0.2 K. It is worth noting that this result is in excellent agreement with our analysis of single-crystal data in this paper and in previously reported work [25,26].…”

Section: Yba 2 Cusupporting

confidence: 91%

“…Similar anomalous temperature and field dependences of |ΔB| 2  were eventually observed in full line shape analyses of P(B) data for YBa 2 Cu 3 O 7-δ crystals, as the quality of specimens improved over time with advancements in crystal growth [14,25,26,36,37]. Initially, linear-in-T forms were seen at low temperatures that were deemed as evidence of d-wave pairing under the rationale that the μ + SR data resemble a similar linearity in the λ derived from microwave impedance [14,36].…”

Section: μ + Sr In Crystals and Powderssupporting

confidence: 63%

“…Given the earlier results for YBa 2 Cu 3 O 7-δ [3][4][5]25,26] as well as the experimental trends observed in sections 4.1 and 4.2 below, we examine whether the temperature dependence of the magnetic penetration depth associated with the true gap function is well approximated by the two-fluid formula [6][7][8][9][10][11][12],…”

Section: Theoretical Modelling Of Fluxon Depinningmentioning

confidence: 94%

“…Since both data sets were acquired on the same sample, at the same magnetic field and over the same temperature range, one would expect them to coincide. While the difference cannot be intrinsic, it can be readily attributed to fluxon pinning effects which can vary with the data acquisition methodology (the glassy relaxation of the fluxons is affected by the temperature scan times or direction and is reflected in the measured σ(T,H); see the (T,H) phase diagram in [26]). Table 1(c) presents the results of fitting the data sets of measurements A and B with the three models for the gap function introduced above, treating E p and  ab (0) as global parameters.…”

Section: Comparison With Random Powder Samples and Application Of Depmentioning

confidence: 99%

“…It was previously shown that temperature-activated fluxon depinning can introduce inflections and linear-like features in the temperature and field-dependence of the a-b planar component σ ab (T,H) for single-crystal YBa 2 Cu 3 O 7-δ [25,26]; of interest here is that the intrinsic form of λ ab (T,H) can be extracted by modelling the pinning perturbation. Unambiguous indicators of fluxon depinning effects are:…”

Section: Introductionmentioning

confidence: 99%

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Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Harshman¹,

Fiory²

2011

J. Phys.: Condens. Matter

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Muon spin rotation (μ + SR) measurements of square-root second moments of local magnetic fields σ in superconducting mixed states, as published for oriented crystals and powder samples of YBa 2 Cu 3 O 7-δ (  0.05), YBa 2 Cu 4 O 8 and La 2x Sr x CuO 4 (x ~ 0.15-0.17), are subjected to comparative analysis for superconducting gap symmetry. For oriented crystals it is shown that anomalous dependences of σ on temperature T and applied field H, as-measured and extracted a-and b-axial components, are attributable to fluxon depinning and disorder that obscure the intrinsic character of the superconducting penetration depth. Random averages derived from oriented-crystal data differ markedly from corresponding non-oriented powders, owing to weaker influence of pinning in high-quality crystals. Related indicators for pinning perturbations such as non-monotonic H dependence of σ, irreproducible data and strong H dependence of apparent transition temperatures are also evident. Strong intrinsic pinning suppresses thermal anomalies in c-axis components of σ, which reflect nodeless gap symmetries in YBa 2 Cu 3 O 7-δ and YBa 2 Cu 4 O 8 . For YBa 2 Cu 3 O 7-δ , the crystal (a-b components, corrected for depinning) and powder data all reflect a nodeless gap (however, a-b symmetries remain unresolved for crystalline YBa 2 Cu 4 O 8 and La 1.83 Sr 0.17 CuO 4 ). Inconsistencies contained in multiple and noded gap interpretations of crystal data, and observed differences between bulk μ + SR and surface-sensitive measurements are discussed.

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Section: Yba 2 Cusupporting

confidence: 91%

Section: μ + Sr In Crystals and Powderssupporting

confidence: 63%

Section: Theoretical Modelling Of Fluxon Depinningmentioning

confidence: 94%

Section: Comparison With Random Powder Samples and Application Of Depmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Harshman¹,

Fiory²

2011

J. Phys.: Condens. Matter

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Effects of Vortex Pinning on the Temperature Dependence of the Magnetic Field Distributions in Superconductors

et al. 2012

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Theory of high-T_Csuperconductivity: transition temperature

Harshman

Fiory

Dow

2011

J. Phys.: Condens. Matter

157

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The superconducting transition temperatures of high-T C compounds based on copper, iron, ruthenium and certain organic molecules are discovered to be dependent on bond lengths, ionic valences, and Coulomb coupling between electronic bands in adjacent, spatially separated layers. 1 Optimal transition temperature, denoted as T C0 , is given by the universal expression k B T C0 = e 2  / ℓζ; ℓ is the spacing between interacting charges within the layers, ζ is the distance between interacting layers and  is a universal constant, equal to about twice the reduced electron Compton wavelength (suggesting that Compton scattering plays a role in pairing). Non-optimum compounds in which sample degradation is evident typically exhibit T C < T C0 . For the 31+ optimum compounds tested, the theoretical and experimental T C0 agree statistically to within  1.4 K. The elemental high T C building block comprises two adjacent and spatially separated charge layers; the factor e 2 / ζ arises from Coulomb forces between them. The theoretical charge structure representing a room-temperature superconductor is also presented.

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Fluxon pinning in the nodeless pairing state of superconducting YBa2Cu3O7

Cited by 4 publications

References 36 publications

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Effects of Vortex Pinning on the Temperature Dependence of the Magnetic Field Distributions in Superconductors

Theory of high-T_Csuperconductivity: transition temperature

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Fluxon pinning in the nodeless pairing state of superconducting YBa2Cu3O7

Cited by 4 publications

References 36 publications

Concerning the superconducting gap symmetry in YBa2Cu3O7 − δ, YBa2Cu4O8, and La2 −xSrxCuO4determined from muon spin rotation in mixed states of crystals and powders

Concerning the superconducting gap symmetry in YBa2Cu3O7 − δ, YBa2Cu4O8, and La2 −xSrxCuO4determined from muon spin rotation in mixed states of crystals and powders

Effects of Vortex Pinning on the Temperature Dependence of the Magnetic Field Distributions in Superconductors

Theory of high-TCsuperconductivity: transition temperature

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Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Concerning the superconducting gap symmetry in YBa₂Cu₃O_{7 − δ}, YBa₂Cu₄O₈, and La_{2 −x}Sr_xCuO₄determined from muon spin rotation in mixed states of crystals and powders

Theory of high-T_Csuperconductivity: transition temperature