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In this paper, low frequency voltage noise property in impurity-doped blue bronzes is investigated. It is found that these low frequency voltage noise can be strongly enhanced by impurities or defects, for which the amplitude and shape of the oscillations are closely related to the initial conducting current of sample during cooling. The results indicate that the origin of the broad-band noise in charge-density-wave system may result from the macroscopic defects or impurities.
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