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Half-flux-quantum magnetoresistance oscillations in disordered metal rings.

The behavior of the magnetoresistance of single and arrays of disordered metal rings is investigated. The average localization length, L/sub c/, which is related with the conductance, is found to oscillate with strong half-flux quantum harmonic at low magnetic field. The ratio of the amplitude of the full-flux oscillations versus the half-flux oscillation is shown to decrease with the number of rings. All numerical results follow a universal law where the amplitude of oscillations of L/sub c/ is found to be proportional to the square of the ratio of L/sub c/ to the perimeter of the ring. At high magnetic fields, full-flux oscillations are observed.