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- W2944169041 abstract "Incommensurate charge density waves (CDW) have the extraordinary ability to display non-Ohmic behavior when submitted to an external field. The mechanism leading to this nontrivial dynamics is still not well understood, although recent experimental studies tend to prove that it is due to solitonic transport. Solitons could come from the relaxation of the strained CDW within an elastic-to-plastic transition. However, the nucleation process and the transport of these charged topological objects have never been observed at the local scale until now. In this paper, we use in situ scanning x-ray microdiffraction with micrometer resolution of a ${mathrm{NbSe}}_{3}$ sample designed to have sliding and nonsliding areas. Direct imaging of the charge density wave deformation is obtained using an analytical approach based on the phase gradient to disentangle the transverse from the longitudinal components over a large surface $(90phantom{rule{4pt}{0ex}}ensuremath{mu}text{m})$. We show that the CDW dissociates itself from the host lattice in the sliding regime and displays a large transverse deformation, ten times larger than the longitudinal one and strongly dependent on the amplitude and the direction of the applied currents. This deformation continuously extends across the macroscopic sample dimensions, over a distance 10 000 times greater than the CDW wavelength despite the presence of strong defects while remaining strongly pinned by the lateral surfaces. This two-dimensional quantitative study highlights the prominent role of the shear effect, which should be significant in the nucleation of solitons." @default.
- W2944169041 created "2019-05-16" @default.
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- W2944169041 date "2020-03-24" @default.
- W2944169041 modified "2023-09-25" @default.
- W2944169041 title "Evidence of charge density wave transverse pinning by x-ray microdiffraction" @default.
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- W2944169041 doi "https://doi.org/10.1103/physrevb.101.125122" @default.
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