Generalized phenomenological model for the magnetic field penetration and magnetization hysteresis loops of a type-II superconductor

Xie, Wei; Liu, Yu-Hao; Wen, Hai‐Hu

doi:10.1103/physrevb.105.014505

Cited by 7 publications

(8 citation statements)

References 60 publications

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“…Figure 1(a) shows the temperature dependence of magnetization measured in the zero-field-cooled mode of Nb 1−x Y x and Nb. All samples are cut into a rectangular shape with almost the same sizes to reduce the interference of demagnetization effect [50,51]. The applied magnetic field is 10 Oe and parallel to the lateral plane of the samples, which is defined as ab-plane.…”

Section: Resultsmentioning

confidence: 99%

“…Figures 3(a)-(c) show the isothermal magnetic-hysteresisloops (MHLs) of Nb 1−x Y x and Nb measured at the same temperature, respectively. The temperature ranges from 2 K to 6 K and the magnetic field ranges from −1 T to 1 T. The field is parallel to the ab-plane of the samples, for the purpose of reducing the influence of the demagnetization effect [50,51]. The MHLs of Nb 1−x Y x show stronger symmetric features with respect to the horizontal line than that of Nb, and this indicates a stronger bulk flux pinning of the alloy [51].…”

Section: Resultsmentioning

confidence: 99%

“…The temperature ranges from 2 K to 6 K and the magnetic field ranges from −1 T to 1 T. The field is parallel to the ab-plane of the samples, for the purpose of reducing the influence of the demagnetization effect [50,51]. The MHLs of Nb 1−x Y x show stronger symmetric features with respect to the horizontal line than that of Nb, and this indicates a stronger bulk flux pinning of the alloy [51]. The avalanchelike flux jump effect with the flux abruptly entering the sample can be seen in Nb 1−x Y x , which is closely related to the thermomagnetic instabilities of the critical state, and it becomes more obvious at low temperatures [54,55].…”

Section: Resultsmentioning

confidence: 99%

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Significant improvement of the lower critical field in Y doped Nb: potential replacement of basic material for the radio-frequency superconducting cavity

Xie

Wang

Fan

et al. 2023

Supercond. Sci. Technol.

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The research of high energy and nuclear physics needs high power accelerators, and the superconducting radio-frequency (SRF) cavity is regarded as the engine of them. Up to now, the widely used practical and effective material for making the SRF cavity is pure Nb. The key parameter that governs the efficiency and the accelerating field (Eacc) of a SRF cavity is the lower critical field Hc1. Here we report a significant improvement of Hc1 of a new type of alloy, Nb1-xYx fabricated by arc melting technique. Experimental investigations with multiple tools including x-ray diffraction, scanning electron microscopy, resistivity and magnetization are carried out, showing that the samples have good quality and a 30-60% enhancement of Hc1. First principle calculations indicate that this improvement is induced by the delicate tuning of a Lifshitz transition of a Nb derivative band near the Fermi energy, which increases the Ginzburg-Landau parameter and Hc1. Our results may trigger a replacement of the basic material and thus a potential revolution for manufacturing the SRF cavity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Significant improvement of the lower critical field in Y doped Nb: potential replacement of basic material for the radio-frequency superconducting cavity

Xie

Wang

Fan

et al. 2023

Supercond. Sci. Technol.

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“…The authors introduce anisotropy into the critical state [28], transforming a 2D critical current density ellipse into a 3D ellipsoid. A generalized phenomenological model is developed for the magnetic field parallel to the mixed state of type-II superconductors, with more in-depth simulations of flux penetration and hysteresis loops [29].…”

Section: Introductionmentioning

confidence: 99%

Critical states of a superconducting slab subjected to tension and bending

Salmi

2023

Phys. Scr.

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This work is an extension of a previous critical-state model proposed by the same author [Li and Gao, SuST (2015)]. We want to show the evolution of critical states for a rather long time, and the physics behind the evolution is also desired. It is another purpose to make clear the role of mechanical deformation played in the evolution process of critical state. We thus develop the model with two new features: a) mechanical loads are applied to both ends of the slab, instead of no external force applied in the previous model; b) the critical current density is now a function of position, rather than a constant over the slab volume as in the previous model. The new results by the model consist of: a) the evolution with time for a given strain value is generally the same as the strain-free case; b) stretching accelerates the development of the critical state, and bending has no significant effect on the critical state; c) the detailed critical-state profiles may provide how to regulate the electromagnetic field by strain in a superconducting device with slab geometry for practical purpose.

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“…It seems that more complex magnetization models have become more popular in recent years [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ], but this is not good news for the engineering applications of the models. These models directly used the classical model as a sub-model, or performed some adaptive improvements to the classical model to improve the applicability.…”

Section: Introductionmentioning

confidence: 99%

An Easily Used Phenomenological Magnetization Model and Its Empirical Expressions Based on Jiles–Atherton Parameters

Xue

Bai

Li³

et al. 2022

Materials

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In this paper, a simple magnetization model convenient for engineering applications is presented based on the expressions of the first-order LTI system model. Considering the trade-off between the nonlinearity of anhysteretic magnetization and the hysteresis width, the proposed model employs two different equations with different magnetic field amplitudes. Furthermore, the proposed model utilizes the first-order LTI system model with a low magnetic field amplitude and a simple nonlinear function, based on the amplitude–frequency function, with a high magnetic field amplitude. Two important characteristic parameters for engineering applications, namely, amplitude and the equivalent phase lag, were exacted and analyzed to validate the computation precision of the proposed model. Then, the model was verified through comparisons to the validated Jiles-Atherton model. For easy use, similar to a physics-based model instead of a fitting method, empirical expressions for the model parameters were given, and applicable ranges of these equations were determined using the parameters of the Jiles-Atherton model. Finally, an example of the magnetization model applied to an on/off type device was computed to further verify the effectiveness of the proposed model with quite a simple expression.

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Generalized phenomenological model for the magnetic field penetration and magnetization hysteresis loops of a type-II superconductor

Cited by 7 publications

References 60 publications

Significant improvement of the lower critical field in Y doped Nb: potential replacement of basic material for the radio-frequency superconducting cavity

Significant improvement of the lower critical field in Y doped Nb: potential replacement of basic material for the radio-frequency superconducting cavity

Critical states of a superconducting slab subjected to tension and bending

An Easily Used Phenomenological Magnetization Model and Its Empirical Expressions Based on Jiles–Atherton Parameters

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