Abstract
We have measured statically (at frequency ω<0.1 Hz) the stress-strain (σ-ɛ) relationship of the charge-density-wave (CDW) material , while simultaneously monitoring the four-probe resistance. We found that an electric field E up to 2–3 times larger than the threshold field for CDW motion had at most a small effect (0<Δɛ/ɛ<0.2%) on the strain at constant stress (Δɛ/ɛ≊-ΔY/Y at constant σ) in contrast to vibrating-reed determinations of ΔY/Y. For E>3 we observed a change in the strain, i.e., the sample length, which was linear in the power; this was suggestive of sample heating. We discuss our results in relation to the recently discovered frequency dependence of Y [X. D. Xiang and J. W. Brill, Phys. Rev. Lett. 63, 1853 (1990)] and the recent phase-relaxation model of elastic softening [G. Mozurkewich, Phys. Rev. B 42, 11183 (1990)].
- Received 14 January 1991
DOI:https://doi.org/10.1103/PhysRevB.43.9972
©1991 American Physical Society