Charging due to Pair-Potential Gradient in Vortex of Type-II Superconductors

Besides the magnetic Lorentz force familiar from the Hall effect in metals and semiconductors, there exists a mechanism for charging peculiar to superconductors that is caused by the pair-potential gradient (PPG). We incorporate it in the augmented quasiclassical equations of superconductivity with...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2017-07, Vol.86 (7), p.73702
Main Authors: Ohuchi, Marie, Ueki, Hikaru, Kita, Takafumi
Format: Article
Language:English
Subjects:
Charging
Hall effect
Lorentz force
Magnetism
Metals
Superconductivity
Superconductors
Temperature
Vortices
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Summary:Besides the magnetic Lorentz force familiar from the Hall effect in metals and semiconductors, there exists a mechanism for charging peculiar to superconductors that is caused by the pair-potential gradient (PPG). We incorporate it in the augmented quasiclassical equations of superconductivity with the Lorentz force to study charging of an isolated vortex in an equilibrium s-wave type-II superconductor. It is found that the PPG mechanism gives rise to charging concentrated within the core whose magnitude at the core center can be 10 to 102 times larger than that caused by the Lorentz force. Our detailed calculations on the spatial, temperature, and magnetic-penetration-depth dependences of the vortex-core charge reveal that the PPG mechanism contributes dominantly to the core charging of the isolated vortex over a wide parameter range. The two mechanisms are also found to work additively at the core center for the present model with an isotropic Fermi surface.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.86.073702