Abstract
While it is well known that the depinning of a charge-density wave (CDW) in a quasi-one-dimensional conductor causes unusual electron transport properties, it also affects the lattice phonons in surprising ways. In this paper, we discuss two such effects. In orthorhombic TaS3, depinning causes low-frequency acoustic velocities to decrease, presumably because the local phase of the CDW can relax in an oscillating strain when it is depinned. We have used torsional oscillator measurements to determine the voltage dependence of the average relaxation time. In monoclinic K0.3MoO3, we have measured changes in the frequencies, oscillator strengths, and bandwidths of optic phonons near current contacts. The sign of these changes depends on the polarity of the current, indicating that they are due to polarization of the CDW which accompanies depinning. (C) 2000 Academic Press.
| Original language | English |
|---|---|
| Pages (from-to) | 105-111 |
| Number of pages | 7 |
| Journal | Journal of Solid State Chemistry |
| Volume | 155 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2000 |
Bibliographical note
Funding Information:We are pleased to be able to contribute this paper honoring J. M. Honig for his many contributions to the science of unusual materials. We thank R. E. Thorne for providing crystals and G. Murthy for helpful discussions. Support for this research was provided by the National Science Foundation, Grants DMR-9300597 and DMR-9731257.
Keywords
- Blue bronze
- Charge-density wave
- Elastic
- Electromechanical
- Electrooptic
- Infrared
- Internal friction
- Phonons
- Shear compliance
- TaS
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry