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Persistent currents in a Moebius ladder are shown to be very sensitive to theeffects of intrachain interactions on the hopping of electrons between chains.Their periodicity as a function of flux is doubled for strong enough repulsiveinteractions because electrons cannot hop coherently between the chains andhave to travel along the full edge of the Moebius ladder, thus encircling theflux twice. Mesoscopic devices that should enable one to observe these effectsare proposed.Comment: 4 Latex pages with 5 encapsulated figures. Requires psfig.st

Persistent currents in a Möbius ladder: A test of interchain coherence of interacting electrons