NMR measurement of drift velocity and phase fluctuations of sliding charge density waves in Rb0.3MoO3

P. Butaud, A. Janossy, P. Segransan, C. Berthier

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1 Citation (Scopus)

Abstract

To determine the velocity of the charge density wave, voltage noise and 87Rb NMR spectra at an electric field of about 15 ET were measured together with I-V characteristics on a Rb0.3MoO3 crystal between 40 and 60K. NMR spectra are reproduced by use of a velocity distribution determined by the noise spectrum, showing that all the electrons condensed below the Peierls gap participate to the Fröhlich mode. A detailed study of NMR sidebands as well as the oscillatory behaviour of the spin echo amplitude demonstrates that the winding rate of the phase νd = ( 1 2π) dφ(R)/dt is equal to the noise frequency νn and gives evidence for the coherence of the CDW sliding motion. This coherence, as well as the stochastic fluctuations of the phase are discussed in the light of spin-spin relaxation time measurements as a function of the applied electric field (E/ET in the range 3-20) between 40 and 90 K. Comparison of voltage noise and NMR spectra between 60 and 90 K indicates that at moderate E/ET ratios large phase fluctuations occur in parts of the crystal which do not contribute to jCDW.

Original languageEnglish
Pages (from-to)499-510
Number of pages12
JournalSynthetic Metals
Volume29
Issue number2-3
DOIs
Publication statusPublished - Mar 21 1989

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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