Version 1
: Received: 27 December 2018 / Approved: 28 December 2018 / Online: 28 December 2018 (16:05:19 CET)
How to cite:
Ishiguri, S.; Tawara, S. Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice. Preprints2018, 2018120351. https://doi.org/10.20944/preprints201812.0351.v1
Ishiguri, S.; Tawara, S. Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice. Preprints 2018, 2018120351. https://doi.org/10.20944/preprints201812.0351.v1
Ishiguri, S.; Tawara, S. Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice. Preprints2018, 2018120351. https://doi.org/10.20944/preprints201812.0351.v1
APA Style
Ishiguri, S., & Tawara, S. (2018). Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice. Preprints. https://doi.org/10.20944/preprints201812.0351.v1
Chicago/Turabian Style
Ishiguri, S. and Shotaro Tawara. 2018 "Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice" Preprints. https://doi.org/10.20944/preprints201812.0351.v1
Abstract
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.
Keywords
superlattice, critical current density, stationary wave, magnetic flux quantum, HTS coil
Subject
Physical Sciences, Condensed Matter Physics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
