Comparative study of critical current densities and flux pinning among a flux-grown<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NdBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi

Higuchi, T.; Yoo, Sang‐Im; Murakami, Masato

doi:10.1103/physrevb.59.1514

Cited by 152 publications

(73 citation statements)

References 61 publications

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“…60,[65][66][67][74][75][76] It is important, therefore, to ensure that the magnetization decay caused by flux creep is much smaller than the M z ͑H y ͒ collapse caused by transverse fields. In the present model, with n = 21, the decay of the average M z with time t after the magnetizing field H z is removed was found to follow the law…”

Section: A Validity Of An E-j Power Law With Finite N Valuementioning

confidence: 99%

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

et al. 2007

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Crossed-magnetic-field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both ͑crossed-͒ magnetic-field directions. The experiments were carried out on bulk melt-processed Y-Ba-Cu-O single domains that had been premagnetized with the applied field parallel to their shortest direction ͑i.e., the c axis͒ and then subjected to several cycles of the application of a transverse magnetic field parallel to the sample ab plane. The magnetic properties were measured using orthogonal pickup coils, a Hall probe placed against the sample surface, and magneto-optical imaging. We show that all principal features of the experimental data can be reproduced qualitatively using a two-dimensional finite-element numerical model based on an E-J power law and in which the current density flows perpendicularly to the plane within which the two components of magnetic field are varied. The results of this study suggest that the suppression of the magnetic moment under the action of a transverse field can be predicted successfully by ignoring the existence of flux-free configurations or flux-cutting effects. These investigations show that the observed decay in magnetization results from the intricate modification of current distribution within the sample cross section. The current amplitude is altered significantly only if a field-dependent critical current density J c ͑B͒ is assumed. Our model is shown to be quite appropriate to describe the cross-flow effects in bulk superconductors. It is also shown that this model does not predict any saturation of the magnetic induction, even after a large number ͑ϳ100͒ of transverse field cycles. These features are shown to be consistent with the experimental data.

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Section: A Validity Of An E-j Power Law With Finite N Valuementioning

confidence: 99%

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

et al. 2007

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“…Следующая точка смены областей режимов находится при поле B LB (large bundlepinning regime -пиннинг больших пучков вихрей). Изменения ви-да зависимости при ещё больших полях могут быть отнесены на счёт появления больших термических флуктуаций [22] при поле B th (thermal fluctuation regime).…”

Section: результаты и их обсуждениеunclassified

Crystal Structure and Properties of the Oxide-Containing Magnesium Diboride Films

Prikhna¹,

Shapovalov²,

Shaternik³

et al. 2016

Metallofiz. Noveishie Tekhnol.

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“…Because the total magnetic moment M is dependent on the sample volume and shape, it is better to use the current density as a basic quantity in comparing the property between different samples. The current density j s can be determined by using j s = 20M/V a(1 − a/3b) based on the extended Bean critical state model [12,13], where M is the total magnetic moment of the sample measured in field descending branch and V, a and b are the volume, width and length ( a < b ) of the sample, respectively. curves indicate the positions of second peaks.…”

Section: Second Peakmentioning

confidence: 99%

Dimensional crossover of vortex dynamics induced by Gd substitution on Bi2212 single crystals

Zhao

Wen

et al. 2003

Physica C: Superconductivity

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The vortex dynamics of Bi 2 Sr 2 Ca 1−x Gd x Cu 2 O 8+δ single crystals is investigated by magnetic relaxation and hysteresis measurements. By substituting Ca with Gd, it is found that the interlayer Josephson coupling is weakened and the anisotropy is increased, which leads to the change of vortex dynamics from 3D elastic to 2D plastic vortex creep. Moreover, the second magnetization peak, which can be observed in samples near the optimal doping, is absent in the strongly underdoped ( with 2D vortex ) region.

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Comparative study of critical current densities and flux pinning among a flux-grownNdBa2Cu3O

Cited by 152 publications

References 61 publications

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

Crystal Structure and Properties of the Oxide-Containing Magnesium Diboride Films

Dimensional crossover of vortex dynamics induced by Gd substitution on Bi2212 single crystals

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