Charging in the vortex lattice of type-II superconductors

Marie Ohuchi; Hikaru Ueki; Takafumi Kita

doi:10.1103/PhysRevB.105.064514

← Back to search

Charging in the vortex lattice of type-II superconductors

Marie Ohuchi, Hikaru Ueki, Takafumi Kita

DOI 10.1103/PhysRevB.105.064514 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We study the magnetic-field dependence of the vortex-core charge in the Abrikosov lattice of an s-wave superconductor based on the augmented quasiclassical equations, where we incorporate the pair-potential gradient (PPG) terms characteristic of charging in superconductors besides the well-known Lorentz force. Our numerical results at T=0.2Tc and 0.5Tc reveal that periodic charge redistribution is superimposed on the magnetic flux-line lattice with different spatial patterns at different fields. The PPG terms are dominant at weak fields over the Lorentz force for accumulating charge in the vortex cores, whereas the Lorentz force prevails at higher fields to give rise to a peak structure in the core charge around H∼12Hc2. We estimate the peak value of the core charge at T=0.2Tc using parameters appropriate for cuprates to obtain a large value of Q∼10−2|e| in the core region of radius 0.2ξ0 in the ab plane and length 1nm along the c axis.