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Giant frictional dissipation peaks and charge-density-wave slips at the NbSe2 surface
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Langer, Markus, Kisiel, Marcin, Pawlak, Rémy, Pellegrini, Franco, Santoro, Giuseppe E., Buzio, Renato, Gerbi, Andrea, Balakrishnan, Geetha, Baratoff, Alexis, Tosatti, Erio and Meyer, Ernst (2014) Giant frictional dissipation peaks and charge-density-wave slips at the NbSe2 surface. Nature Materials, Volume 13 (Number 2). pp. 173-177. doi:10.1038/nmat3836
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Official URL: http://dx.doi.org/10.1038/nmat3836
Abstract
Understanding nanoscale friction and dissipation is central to nanotechnology1, 2, 3, 4. The recent detection of the electronic-friction drop caused by the onset of superconductivity in Nb (ref. 5) by means of an ultrasensitive non-contact pendulum atomic force microscope (AFM) raised hopes that a wider variety of mechanical-dissipation mechanisms become accessible. Here, we report a multiplet of AFM dissipation peaks arising a few nanometres above the surface of NbSe2—a layered compound exhibiting an incommensurate charge-density wave (CDW). Each peak appears at a well-defined tip–surface interaction force of the order of a nanonewton, and persists up to 70 K, where the short-range order of CDWs is known to disappear. Comparison of the measurements with a theoretical model suggests that the peaks are associated with local, tip-induced 2π phase slips of the CDW, and that dissipation maxima arise from hysteretic behaviour of the CDW phase as the tip oscillates at specific distances where sharp local slips occur.
| Item Type: | Journal Article | ||||||||||
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| Divisions: | Faculty of Science > Physics | ||||||||||
| Journal or Publication Title: | Nature Materials | ||||||||||
| Publisher: | Nature Publishing Group | ||||||||||
| ISSN: | 1476-1122 | ||||||||||
| Official Date: | February 2014 | ||||||||||
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| Volume: | Volume 13 | ||||||||||
| Number: | Number 2 | ||||||||||
| Page Range: | pp. 173-177 | ||||||||||
| DOI: | 10.1038/nmat3836 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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