Anisotropic critical currents in Ba2YCu3O7 analyzed using an extended Bean model

Gyorgy, E. M.; Dover, R. B. van; Jackson, K. A.; Schneemeyer, Lynn; Waszczak, J. V.

doi:10.1063/1.102387

Cited by 797 publications

(279 citation statements)

References 5 publications

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“…3 (b)). Such a configuration looks similar, but evidently is of quite a different nature, as that described in high-To single crystals which have anisotropic jc values in the plane parallel to the c-axis [20]. The anisotropy induced by Bx is more pronounced at higher temperatures as follows from the temperature dependence of the length b defined in the inset of Fig.…”

Section: Resultsmentioning

confidence: 56%

Anisotropy of perpendicular field penetration into high-Tc superconductors induced by strong longitudinal field

Indenbom¹,

Forkl²,

Ludescher³

et al. 1994

Physica C: Superconductivity

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Anisotropy of perpendicular field penetration into high- General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractThe geometry of penetration of a magnetic field oriented perpendicular to the surface of a superconductor is changed by the presence of a longitudinal field. This is studied directly by means of the magneto-optical technique in different high-Tc materials. In YBa2Cu307 single crystals Brandt's mode of magnetization is observed, namely, penetration of an AC field only along the longitudinal field even if the corresponding dimension of the sample is much longer than the other two. This anisotropy is the evidence that the force-free configuration of current and vortices cannot be destroyed by cutting and reconnection of the vortices in this 3D superconductor. On the contrary, the absence of the induced anisotropy in Bi2Sr2CaCu2Os single crystals reveals the independence of pancake vortices in CuO layers from longitudinal field which makes a realization of the force-free configuration impossible in the layered 2D superconductor. An intermediate effect in thin films indicates that vortices are almost normal to the film surface even if the applied field is nearly parallel to it. The described experiment can be used as a new tool to study the internal vortex structure in superconductors.

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Section: Resultsmentioning

confidence: 56%

Anisotropy of perpendicular field penetration into high-Tc superconductors induced by strong longitudinal field

Indenbom¹,

Forkl²,

Ludescher³

et al. 1994

Physica C: Superconductivity

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“…Importantly, the MHL of the intercalated crystal is much larger than that of parent one, implying that the pinning force is greatly enhanced in the intercalated sample. According to the Bean model [22,23], the critical current density can be determined from the MHLs. For a rectangularly-shaped crystal with dimension c < a < b, when H c, the in-plane critical current density J ab c (µ 0 H) is given by…”

Section: Resultsmentioning

confidence: 99%

Critical current density and vortex pinning mechanism of Li_x(NH₃)_yFe₂Te${}_{1.2}$Se${}_{0.8}$ single crystals

Wang

Sun

Lei

2017

Supercond. Sci. Technol.

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Abstract.We grew Li x (NH 3 ) y Fe 2 Te 1.2 Se 0.8 single crystals successfully using the lowtemperature ammonothermal method and the onset superconducting transition temperature T onset c is increased to 21 K when compared to 14 K in the parent compound FeTe 0.6 Se 0.4 . The derived critical current density J c increases remarkably to 2.6×10 5 A/cm 2 at 2 K. Further analysis indicates that the dominant pinning mechanism in Li x (NH 3 ) y Fe 2 Te 1.2 Se 0.8 single crystal is the interaction between vortex and surfacelike defects with normal core, by variations in the charge-carrier mean free path l near the defects (δl pinning). Moreover, the flux creep is important to the vortex dynamics of this material.

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“…The semilog plot in Figure 3 compares Jc at 20 K versus magnetic field applied normal to the T1-2212 film surface for an as-grown film and films irradiated with 30,60 and 88 MeV Au ions. Jc was extracted from the hysteresis data using the Bean critical state model and the dimensions of the entire sample with the appropriate geometric correction [25].…”

Section: Resultsmentioning

confidence: 99%

Correlation of intermediate ion energy induced extended defect continuity to enhanced pinning potential in Tl-2212 films

Newcomer¹,

Venturini²,

Doyle³

et al. 1998

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O S T ILattice defects are introduced into the structure to suppress the motion of magnetic vortices and enhance the critical current density in high temperature superconductors. Point defects are not very effective pinning sites for the cuprate superconductors; however, extended defects, such as linear tracks, have been shown to be strong pinning sites. We study the superconducting cuprate T1-22 12 (the numbers designate TI-Ba-Ca-Cu stoichiometry). Large enhancements of vortex pinning potential were observed in TI-22 12 after high-intermediate energy heavy-ion irradiations where non-continuous extended defects were induced at dE/dx of 9 to 15.2 keV/nm (60 MeV Au, 60 MeV Cu, and 30 MeV Au) and continuous linear defects were induced at 19.5keV/nm (88MeV Au). Our research addresses the question of pinning in highly anisotropic materials like T1-22 12 where the vortices are "pancakes" rather than "rods" and suitable defect structures may be discontinuous extended damage domains. The defect microstructure and the effectiveness of the pinning potential in T1-2212 after irradiation by intermediate energy Au at lower dE1.x of 5-15 keV/nm, where recoils are more significant, is studied using high resolution transmission electron microscopy digital imaging and a SQUID magnetometer. The nature of the ion irradiation damage at these intermediate dE/dx will be correlated to the average vortex pinning potential and the TRIMRC calculations for recoils.

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Anisotropic critical currents in Ba2YCu3O7 analyzed using an extended Bean model

Cited by 797 publications

References 5 publications

Anisotropy of perpendicular field penetration into high-Tc superconductors induced by strong longitudinal field

Anisotropy of perpendicular field penetration into high-Tc superconductors induced by strong longitudinal field

Critical current density and vortex pinning mechanism of Li_x(NH₃)_yFe₂Te${}_{1.2}$Se${}_{0.8}$ single crystals

Correlation of intermediate ion energy induced extended defect continuity to enhanced pinning potential in Tl-2212 films

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Anisotropic critical currents in Ba2YCu3O7 analyzed using an extended Bean model

Cited by 797 publications

References 5 publications

Anisotropy of perpendicular field penetration into high-Tc superconductors induced by strong longitudinal field

Anisotropy of perpendicular field penetration into high-Tc superconductors induced by strong longitudinal field

Critical current density and vortex pinning mechanism of Lix(NH3)yFe2Te${}_{1.2}$Se${}_{0.8}$ single crystals

Correlation of intermediate ion energy induced extended defect continuity to enhanced pinning potential in Tl-2212 films

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Critical current density and vortex pinning mechanism of Li_x(NH₃)_yFe₂Te${}_{1.2}$Se${}_{0.8}$ single crystals