Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-12-10
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 4 figures, submitted to Phys. Rev. B
Scientific paper
10.1016/j.ssc.2007.12.014
We have studied changes in charge-density-wave strain under application of square-wave currents of variable amplitude and frequency by numerically solving the phase-slip augmented diffusion model introduced by Adelman et al (Phys. Rev. B 53, 1833 (1996)). The frequency dependence of the strain, at each position and amplitude, was fit to a modified harmonic oscillator expression, and the position and current dependence of the fitting parameters determined. In particular, the delay time (1/resonant frequency) vanishes adjacent to the contact and grows with distance from the contact, and both the delay time and relaxation time decrease rapidly with increasing current (and phase-slip rate), as experimentally observed in the electro-optic response of blue bronze. We have also found that pinning the phase at the contacts causes more rapid changes in strain between the contacts than allowing the phase to flow outside the contacts.
Brill Joseph W.
Ladino L.
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