NONLINEAR EFFECTS IN SMALL o-TaS3 SAMPLES

Borodin, D.; Nad, F.; Savitskaya, Ya.S.; Zaĭtsev-Zotov, S. V.

doi:10.1016/b978-1-4832-2812-9.50025-2

Cited by 1 publication

(4 citation statements)

References 7 publications

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“…5. The experimental threshold E th (blue dots) versus the sample cross section in small o-TaS3 samples from [24]. The fit using Eq.16 (red line) correctly reproduces the whole behavior especially the increase of E th for decreasing cross sections and the asymptotic constant value for large cross sections (no bulk pinning is used in the fit).…”

Section: 100mentioning

confidence: 64%

“…However, longitudinal pinning is not the only constraint applied to the CDW. Resistivity measurements have shown that transverse pinning at lateral sample surfaces may also play an important role since the threshold field E th diverges with decreasing sample cross sections in NbSe 3 [23,18] and in TaS 3 [24]. In a recent paper [25], transverse pinning was indeed observed at the local scale by scanning x-ray microdiffraction in NbSe 3 .…”

Section: Introductionmentioning

confidence: 94%

“…It is interesting to consider this dependence since the observed increase of E th with decreasing cross sections can not be explained by the bulk pinning frequency ω 0 alone. We use data from [24] of the threshold field as a function of the sample cross section A = L y L z in small o-TaS 3 samples. The first (2n y + 1) cy Ly term in the expression of a ny,nz Eq14 can be neglected since…”

Section: E Th As a Function Of The Sample Cross Sectionmentioning

confidence: 99%

“…We will show in the following that taking into account lateral surface pinning naturally leads to convergence towards a non-diverging finite threshold. On the other hand, Borodin et al [24] considered the effect of the sample cross section and found a power law behavior E th ∝ A −1/2 with A = L y × L z .…”

Section: Introductionmentioning

confidence: 99%

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The essential role of surface pinning in the dynamics of charge density waves submitted to external dc fields

et al. 2020

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A Charge Density Wave (CDW) submitted to an electric field displays a strong shear deformation because of pinning at the lateral surfaces of the sample. This CDW transverse pinning was recently observed but has received little attention from a theoretical point of view until now despite important consequences on electrical conductivity properties. Here, we provide a description of this phenomenon by considering a CDW submitted to an external dc electric field and constrained by boundary conditions including both longitudinal pinning due to electrical contacts and transverse surface pinning. A simple formula for the CDW phase is obtained in 3D by using the Green function and image charges method. In addition, an analytical expression of the threshold field dependence on both length and sample cross section is obtained by considering the phase slip process. We show that the experimental data are well reproduced with this model and that bulk pinning can be neglected. This study shows that the dynamical properties of CDW systems could be mainly driven by boundary effects, despite the comparatively huge sample volumes.

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Section: 100mentioning

confidence: 64%