Evaluation of critical current based on a new transition concept

Ishiguri, Shinichi; Satô, Takao

doi:10.1016/j.physc.2008.12.007

Cited by 7 publications

(20 citation statements)

References 5 publications

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“…The calculated current densities for each case were combined, and the critical current density was calculated. Theoretical data agreed with measured data [13].…”

Section: Introductionsupporting

confidence: 78%

“…Thus, each flux quantum is weakly fixed by the repulsive force from the neighboring flux quanta. When a strong magnetic field is applied, the number of magnetic flux quanta increases because the radius of each magnetic flux quantum decreases [13] to maintain the constant value of each quantum constant, h/2e.…”

Section: A Transition Concept Assuming the Superlatticementioning

confidence: 99%

“…Recently, high-temperature superconductors including Fe-based materials have been investigated thoroughly [1][2][3][4][5][6][7][8][9][10][11][12]. Discussions of these superconductors have mainly centered on critical quantities [13] such as temperature or current density. Research on the magnetic flux quanta and the trends relating to the critical current density are important; in general, critical current density depends on the magnitude and angle of the applied magnetic field at constant temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous article [13], we proposed a transition concept under an applied magnetic field where the transition is defined as the point at which the stationary wave surrounding the flux quantum vanishes with the destruction of a Cooper pair, i.e., wherein the radius of the stationary wave decreases until it is equivalent to that of the pinning potential and circular motion ceases, thus resulting in the destruction of Cooper pairs. In that concept, increasing the applied magnetic field decreases the radius of the stationary wave such that the value of the flux quantum (h/2e) remains constant, and the density of flux quanta in the sample increases.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice

Ishiguri¹,

Tawara²

2018

Preprint

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In the present work, a superlattice structure comprising superconducting and insulator layers is studied. Here, if a magnetic field is applied parallel to the layers, the lack of a pinning center leads to a novel transition; in particular, as the applied magnetic field is reduced, the stationary wave surrounding the magnetic flux quantum in the superconducting layer eventually collides with the superconducting–insulating interfaces on both sides because its radius becomes larger than the width of the superconducting layer. At this instant, the stationary wave will collapse, and a transition will occur: the magnetic quanta are collapsed and thus the uniform magnetic field distribution is achieved, which corresponds to the transition from the superconducting state to the normal state over critical current. Considering a one-dimensional model of the structure, a critical current density equation is derived that indicates an increase in the critical current density for increased applied magnetic field. Subsequently, the same calculation was conducted after changing the direction of the magnetic field component, and the combination of these two calculations expresses the anisotropic property of the structure. The phenomenon is also predicted for anisotropic critical current density. This phenomenon is an important discovery that helps manufacture high-temperature superconducting tape as well as large high-temperature superconducting coils.

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“…The calculated current densities for each case were combined, and the critical current density was calculated. Theoretical data agreed with measured data [13].…”

Section: Introductionsupporting

confidence: 78%

Section: A Transition Concept Assuming the Superlatticementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice

Ishiguri¹,

Tawara²

2018

Preprint

Self Cite

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show abstract

“…This reason is that, in condensed matter physics, physical aspects are unique in addition to their high critical temperatures. [1][2][3][4][5][6][7][8]14] However, in considering applications, the fact that the refrigeration is needed must be disadvantage. Thus we need to obtain no refrigeration superconductors.…”

Section: Introductionmentioning

confidence: 99%

New Superconductivity and Theoretical Study on a New Phenomenon of Energy Source with Assistance of Initial Experiments

Ishiguri¹

2018

Preprint

Self Cite

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We previously reported new superconductivity produced by an electrostatic field and a diffusion current in a semiconductor without refrigeration. In particular, the superconductivity was investigated theoretically and confirmed experimentally. Here, we determine that the derived superconducting quantum state can be reproduced in a capacitor. When circuits are formed with this new-type capacitor and diodes, a magnetic field is applied to the diodes’ depletion layer. The depletion layer is biased because of the conversion from the magnetic-field energy to electric-field energy, resulting in the diodes’ spontaneously emitting a current. Thus, the new-type capacitor is charged using no other energy source. This new phenomenon is described theoretically with assistance of initial experiments.

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Performance improvements and optimization of new high-temperature superconducting coil with circle vacancies at edge portions

Nagai¹,

Ishiguri²

2013

Physica C: Superconductivity

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Evaluation of critical current based on a new transition concept

Cited by 7 publications

References 5 publications

Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice

Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice

New Superconductivity and Theoretical Study on a New Phenomenon of Energy Source with Assistance of Initial Experiments

Performance improvements and optimization of new high-temperature superconducting coil with circle vacancies at edge portions

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