Cross-flow of flux lines in the weak link regime of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

LeBlanc, M. A. R.; Çelebi, S.; Wang, Sean X.; Plecháček, V.

doi:10.1103/physrevlett.71.3367

Cited by 36 publications

(29 citation statements)

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“…In a 3D superconductor like YBCO the force-free configuration can be very stable and the perpendicular-field component will not penetrate through the existing array of longitudinal vortices, contrary to some integral measurements [ 16 ]. Such a cross-penetration can take place in materials with some internal weak connections like BSCCO, where vortex lines can easily be cut and reconnected or are already decomposed into independent pancake vortex lattices and Josephson vortices.…”

Section: Discussionmentioning

confidence: 99%

“…The former is analogous to the force-free current configuration which was first discussed 30 years ago (see references in Ref. [ 14 ] ) and which is still a topical problem now [ 15,16 ]. Thus, contrary to the case B,= 0 where the supercurrent density j in any direction is limited by its critical valuej¢ (isotropic current limiting), in the presence of Bx, the component j, does not produce a large enough driving force and can be much larger than j~ (anisotropic current limiting).…”

Section: Resultsmentioning

confidence: 99%

“…So far, the problem of the forcefree configuration has remained very controversial and numerous special experimental and theoretical works (see, for example, Refs. [16,17] and references therein) do not answer the question whether stable force-free configurations exist or if these will be destroyed by flux-line cutting and reconnection. Usually the investigations are devoted to looking for the latter processes and their phenomenologieal description.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…For measurements where the specimen is warmed from T 0 = 77 K to T c , the X axis is driven by a signal proportional to t h , the length of time a constant current I h flows through the electric heater. The diagram of the experimental set up is given in our previous communication [31,32]. This current I h is applied rapidly and maintained constant at the preselected value I h until T c is attained.…”

Section: Methodsmentioning

confidence: 99%

Thermal Release of Hidden Magnetic Moments in High T c Bi:2223/Ag Superconducting Tape During Warming to T c

Çelebi

LeBlanc

2011

J Supercond Nov Magn

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We report on measurements of the evolution of the magnetization M , upon warming from T 0 (77 K) to T c , for Bi:2223/Ag tape prepared by the continuous filling and forming (CTFF) with the locus of M initially situated along bridges between the envelopes of the major hysteresis curves. Concentric, oppositely directed magnetic moments coexist in the specimens when M lies along the bridges. We focused on the cases where M = 0, hence before warming, the constituent moments cancel each other exactly. Since they diminish in magnitude at different rates as T is increased to T c , their sequential "release" leads to a rich variety of phenomena. A comparison of experimental and theoretical results shows that our simple model semiquantitatively reproduces the major features of the observations on the specimen of Bi:2223/Ag tape.

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“…LeBlanc et. al [13][14][15], have done experiments in the last decades that have shown flux-cutting presence in materials with low or high κ, and low or high T c . In the Clem et.…”

Section: Flux-line Cuttingmentioning

confidence: 99%