Phys. Rev. Lett. 56, 1952–1955 (1986)Elastic Properties of Charge-Density-Wave Conductors: ac-dc Electric Field CouplingReceived 21 October 1985; revised 14 February 1986; published in the issue dated 5 May 1986 We have measured Young's modulus Y and internal friction δ of the charge-density-wave (CDW) conductors TaS3 and NbSe3, in the presence of combined ac and dc electric fields. In the pinned CDW state, the elastic properties are sensitive to even small ac-field amplitudes. In the sliding-CDW state, sharp harmonic and subharmonic anomalies are observed in Y and δ; these coincide with Shapiro-type interference in the electronic response. Our experiments demonstrate that internal degrees of freedom (incoherence) of the CDW condensate are intimately tied to the dc- and ac-field-induced elastic anomalies. © 1986 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.56.1952
DOI:
10.1103/PhysRevLett.56.1952
PACS:
72.15.Nj
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