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It is proposed that ac voltage (v₀₂) oscillations observed in sliding charge-density-wave systems are caused by phase vortices at the sample ends. The model's prediction that v₀₂ is length independent is verified experimentally. The long-range phase coherence implied by thermal-gradient experiments is consistent with the vortex model but not with models based on impurities.
Ong et al. (Mon,) studied this question.
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