The Aharonov-Bohm (AB) effect has been accepted and has promotedinterdisciplinary scientific activities in modern physics. To observe the ABeffect in condensed matter physics, the whole system needs to maintain phasecoherence, in a tiny ring of the diameter 1 micrometer and at low temperaturesbelow 1 K. We report that AB oscillations have been measured at hightemperature 79 K by use of charge-density wave (CDW) loops in TaS3 ringcrystals. CDW condensate maintained macroscopic quantum coherence, whichextended over the ring circumference 85 micrometer. The periodicity of theoscillations is h/2e in accuracy within a 10 percent range. The observation ofthe CDW AB effect implies Frohlich superconductivity in terms of macroscopiccoherence and will provide a novel quantum interference device running at roomtemperature.
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