Charge distribution in thin mesoscopic superconducting rings with enhanced surface superconductivity

Guo-Qiao Zha; Shi-Ping Zhou; Bao-He Zhu; Yao-Ming Shi

doi:10.1103/PhysRevB.73.104508

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Charge distribution in thin mesoscopic superconducting rings with enhanced surface superconductivity

Guo-Qiao Zha, Shi-Ping Zhou, Bao-He Zhu, Yao-Ming Shi

DOI 10.1103/PhysRevB.73.104508 · Physical Review B

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Abstract

The charge distribution in a thin mesoscopic superconducting ring with enhanced surface superconductivity (of a negative surface extrapolation length b) is investigated by the phenomenological Ginzburg-Landau theory. The nature of charge distribution is considerably influenced by the extrapolation length b, the inner and outer radius, and the applied magnetic field. We find a complete negative charge distribution besides the conventional charge distributions of charging vortex states in the Meissner state and the giant vortex state. In addition, one type of charge distribution that only exists in a giant vortex state can also be found in the Meissner state for a ring with a small inner radius. For the multivortex state, we find that the stable multivortex state can exist in small mesoscopic superconducting rings that we studied. The charge distributions for different kinds of multivortex states are given.