Flux-line cutting in hard superconductors

Romero-Salazar, C.; Valenzuela-Alacio, L. D.; Carballo-Sánchez, A. F.; Pérez-Rodrı́guez, F.

doi:10.1007/bf02769584

Cited by 3 publications

(7 citation statements)

References 17 publications

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“…In addition, in the geometry of crossed fields, the OECSM is able to reproduce the families of experimental curves [30,31] of the average magnetization for a VTi ribbon versus the external magnetic field H y for the components M y and M z at different dc-bias fields H z and for initial nonmagnetic states. The good agreement between theory [27,29] and experiments [30,31] was achieved using a large anisotropy parameter J c /J c⊥ = 6.…”

Section: Introductionsupporting

confidence: 58%

“…For this reason, new models have been proposed to explain both the collapse of the magnetic moment and the phenomena arising when the anisotropy induced by flux-line cutting is considerably high. Among them, we should mention (i) the extension to the GDCSM model (hereafter the BMM), proposed by Brandt and Mikitik [25]; (ii) the variational approach developed by Badía-Majós, López, and Ruiz (here called BLRM) [26]; and (iii) the original elliptic flux-cutting critical-state model (OECSM) [27][28][29]. The latter model postulates…”

Section: Introductionmentioning

confidence: 99%

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On the extended elliptic critical-state model for hard superconductors

Cortés-Maldonado

Peña-Seaman

Garcı́a-Vázquez

et al. 2013

Supercond. Sci. Technol.

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The magnetic behavior of an irreversible type-II superconducting slab under the action of in-plane crossed fields is investigated within both the original elliptic critical-state model and the extended one, which was recently proposed by Clem. In particular, we study the suppression of the remanent magnetization of a PbBi specimen by a sweeping external transverse magnetic field. It is found that both elliptic critical-state models reproduce the main features of available experimental magnetization curves. We also show that the average magnetizations, corresponding to diamagnetic and paramagnetic initial states at a static bias field H z , are asymmetrically reduced by the action of an oscillating transverse field H y . If the amplitude of the oscillations of H y is as large as the first penetration field H P , the resulting state becomes paramagnetic after various cycles of H y . Such a kind of paramagnetism is attributed to the anisotropy, induced by flux-line cutting effects, in the critical current density. In PbBi samples, paramagnetism is expected to be manifest in a wide range of values of the static bias field H z .

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

On the extended elliptic critical-state model for hard superconductors

Cortés-Maldonado

Peña-Seaman

Garcı́a-Vázquez

et al. 2013

Supercond. Sci. Technol.

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“…[23,24]. The elliptic model also describes the behavior of < M y > (H y ) and < M z > (H y ) in crossed fields H y and H z [19,25], which was observed in the experiments on a VTi ribbon with nonmagnetic initial state [14,26]. Here, the good agreement with the experiment was achieved by using a relatively large anisotropy parameter J c /J c⊥ = 6.…”

Section: Introductionmentioning

confidence: 62%

Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field

Cortés-Maldonado

Espinosa-Rosales

Carballo-Sánchez³

et al. 2011

Low Temperature Physics

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The magnetic response of irreversible type-II superconductor slabs subjected to in-plane rotating magnetic field is investigated by applying the circular, elliptic, extended-elliptic, and rectangular flux-line-cutting critical-state models. Specifically, the models have been applied to explain experiments on a PbBi rotating disk in a fixed magnetic field Ha, parallel to the flat surfaces. Here, we have exploited the equivalency of the experimental situation with that of a fixed disk under the action of a parallel magnetic field, rotating in the opposite sense. The effect of both the magnitude Ha of the applied magnetic field and its angle of rotation αs upon the magnetization of the superconductor sample is analyzed. When Ha is smaller than the penetration field HP , the magnetization components, parallel and perpendicular to Ha, oscillate with increasing the rotation angle. On the other hand, if the magnitude of the applied field, Ha, is larger than HP , both magnetization components become constant functions of αs at large rotation angles. The evolution of the magnetic induction profiles inside the superconductor is also studied.

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“…21 Due to the limitations of the GDCSM and the TVHM, the elliptic flux-line-cutting critical-state model ͑EFLCCSM͒ 3 was introduced. This simple phenomenological model had described quite well the magnetic response of slabs, in parallel geometry, for multicomponent situations, 3,26,27 in comparison with previous models. According to the EFLCCSM material law E͑J͒, each component J Ќ and J ʈ of the current density is determined by both components of the electric field E Ќ and E ʈ .…”

Section: Introductionmentioning

confidence: 85%

“…Thus, at present, the flux-line-cutting phenomenon is an interesting topic of research. 3,5,10,11,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Indeed, there is experimental evidence, related with the crossing energy calculation, which supports that a small number of vortices or adjacent sheets of vortices can cut through each other. [28][29][30][31][32] Recently, Olson Reichhardt and Hastings have proposed an experiment employing a magnetic force microscope to test how easily the vortex lines can cut through each other.…”

Section: Introductionmentioning

confidence: 97%

Flux-line cutting in rotating type-II superconductors in parallel geometry

Romero-Salazar¹,

Hernández-Flores²

2008

Journal of Applied Physics

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Experimental results of a type-II superconductor, undergoing slow oscillations in a static magnetic field, have been theoretically investigated. The theoretical description considers the occurrence of flux-line cutting since the critical currents have a parallel component to the magnetic induction B. For this purpose, the elliptic flux-line-cutting critical-state model has been employed to calculate the magnitude B and orientation α(x) of the magnetic induction. Hysteresis loops, at different initial magnetic states and, at relatively small and large amplitudes of oscillation, are calculated numerically and compared with experimental data of a Nb disk. The complex behavior of the hysteresis loops is associated with the magnetic induction consumption. Our results are compared with those obtained employing the generalized double critical-state model. Our elliptic model is not restricted by the isotropic condition, that establishes that the electric field E is parallel to the current density J, but considers an induced anisotropy by flux line cutting. The limits of applicability of the elliptic model are discussed.

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Flux-line cutting in hard superconductors

Cited by 3 publications

References 17 publications

On the extended elliptic critical-state model for hard superconductors

On the extended elliptic critical-state model for hard superconductors

Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field

Flux-line cutting in rotating type-II superconductors in parallel geometry

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