Oxygen-defect flux pinning, anomalous magnetization and intra-grain granularity in YBa2Cu307–δ

Daeumling, M.; Seuntjens, J. M.; Larbalestier, D. C.

doi:10.1038/346332a0

Cited by 790 publications

(296 citation statements)

References 22 publications

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“…(following an initial increase and subsequent decrease due to complete field penetration, the "first peak") is the "second peak" or "fishtail" anomaly [98][99][100]. The relation between j c and the width of the hysteresis loop follows from:…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

Phase behavior of type-II superconductors with quenched point pinning disorder: A phenomenological proposal

Menon

2002

Phys. Rev. B

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A general phenomenology for phase behaviour in the mixed phase of type-II superconductors with weak point pinning disorder is outlined. We propose that the "Bragg glass" phase generically transforms via two separate thermodynamic phase transitions into a disordered liquid on increasing the temperature. The first transition is into a glassy phase, topologically disordered at the largest length scales; current evidence suggests that it lacks the longranged phase correlations expected of a "vortex glass". This phase has a significant degree of short-ranged translational order, unlike the disordered liquid, but no quasi-long range order, in contrast to the Bragg glass. This glassy phase, which we call a "multi-domain glass", is confined to a narrow sliver at intermediate fields, but broadens out both for much larger and much smaller field values. The multi-domain glass may be a "hexatic glass"; alternatively, its glassy properties may originate in the replica symmetry breaking envisaged in recent theories of the structural glass transition. Estimates for translational correlation lengths in the multi-domain glass indicate that * Email:menon@imsc.ernet.in 1 they can be far larger than the interline spacing for weak disorder, suggesting a plausible mechanism by which signals of a two-step transition can be obscured. Calculations of the Bragg glass-multi-domain glass and the multidomain glass-disordered liquid phase boundaries are presented and compared to experimental data. We argue that these proposals provide a unified picture of the available experimental data on both high-T c and low-T c materials, simulations and current theoretical understanding.

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Section: Discussion Of Experimentsmentioning

confidence: 99%

Phase behavior of type-II superconductors with quenched point pinning disorder: A phenomenological proposal

Menon

2002

Phys. Rev. B

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“…Tunneling between such domains leads to intrinsic granular superconductivity (GS) in high-T c superconductors (HTS). Probably one of the first examples of GS was observed in Y Ba 2 Cu 3 O 7−δ single crystals in the form of the so-called "fishtail" anomaly of magnetization [3]. The granular behavior has been related to the 2D clusters of oxygen defects forming twin boundaries (TBs) or dislocation walls within CuO plane that restrict supercurrent flow and allow excess flux to enter the crystal.…”

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confidence: 99%

Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

Sergeenkov¹

2007

Journal of Applied Physics

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Using a 2D model of capacitively coupled Josephson junction arrays (created by a network of twin boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals), we study the influence of chemical pressure (∇µ) on nonlinear (i.e., ∇T -dependent) thermal conductivity (NLTC) of an intrinsically granular superconductor.Quite a substantial enhancement of NLTC is predicted when intrinsic chemoelectric field E µ ∝ ∇µ closely matches the externally produced thermoelectric field E T ∝ ∇T . The estimates of the model parameters suggest a realistic possibility to experimentally monitor this effect in non-stoichiometric high-T C superconductors. background. In particular, it was found that at low levels of hole doping (δ < 0.2), the

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“…9 It is suggested that the PE is associated with the rapid softening of the flux line lattice. 10 In high temperature superconductors, different mechanisms including inhomogeneity of the sample, 11 Dynamic effects, 12 structural phase transition in the vortex lattice, 13 vortex order-disorder phase transition, 14,15 and cross over from elastic to plastic creep 16 have been proposed to explain the SMP. It is reported SMP occur in SmFeAsO 0.9 F 0.1 (Ref.…”

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confidence: 99%

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Shahbazi

Wang

Choi

et al. 2013

Applied Physics Letters

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The flux pinning mechanism of BaFe1.9Ni0.1As2 superconducting crystals have been investigated systematically by magnetic measurements up to 13 T at various temperatures. The field dependence of the critical current density, Jc, was analysed within the collective pinning model. A remarkably good agreement between the experimental results and theoretical δl pinning curve is obtained, which indicates that pinning in BaFe1.9Ni0.1As2 crystal originates from spatial variation of the mean free path. Moreover, the normalized pinning force density, Fp, curves versus h = B/Birr (Birr is the irreversibility field) were scaled using the Dew-Hughes model. Analysis suggests that point pinning alone cannot explain the observed field variation of Fp.

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Oxygen-defect flux pinning, anomalous magnetization and intra-grain granularity in YBa2Cu307–δ

Cited by 790 publications

References 22 publications

Phase behavior of type-II superconductors with quenched point pinning disorder: A phenomenological proposal

Phase behavior of type-II superconductors with quenched point pinning disorder: A phenomenological proposal

Influence of chemical pressure effects on nonlinear thermal conductivity of intrinsically granular superconductors

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

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