Superconducting state evolution with applied magnetic flux in mesoscopic rings |
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| Authors: | G Q Zha |
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| Institution: | (1) Research Center for Superconductor Photonics, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan ,;(2) Department of Electrical and Electronic Engineering, Utsunomiya University , 7-1-2 Yoto, Utsunomiya 321-8585, Japan ,;(3) Institute for Solid State Physics, The University of Tokyo , Kashiwanoha, Kashiwa-shi, Chiba 277-8581, Japan ,;(4) Division of Physics, Graduate School of Science, Hokkaido University , Kita-ku, Sapporo 060-0810, Japan , |
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| Abstract: | The magnetic flux dependence of the vortex state for small mesoscopic superconducting
rings surrounded by a medium is investigated by the phenomenological Ginzburg-Landau
theory. The influences of the ring size and the surface superconductivity on the free
energy and total supercurrent are studied. For narrow rings, the persistent current
evolves towards a periodic behaviour with magnetic flux. The complete paramagnetic or
diamagnetic state, corresponding to positive or negative current flowing in the whole
ring, can occur. A remarkable intermittent superconducting behaviour for the ground-state
transition is found when the strength of surface-suppressed superconductivity is enlarged
or the ring size is decreased. Consequently, a pure superconducting state with positive
total current can be obtained. |
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