SPONTANEOUS CURRENTS IN MESOSCOPIC RINGS

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Abstract
In a system of mesoscopic rings the influence of orbital magnetic interaction between the electrons is investigated. At a critical temperature Tc the system undergoes a phase transition into a current carrying state. Tc depends strongly on geometry of the system and/or its Fermi-surface, and on the quantum size gap at the Fermi level. Elastic scattering reduces Tc and eventually suppresses the transition.

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