Understanding nanoscale friction and dissipation is central to nanotechnology(1-4). The recent detection of the electronicfriction 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 chargedensity 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 2 pi 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.

Giant frictional dissipation peaks and charge-density-wave slips at the NbSe2 surf / Markus, Langer; Marcin, Kisiel; Remy, Pawlak; Pellegrini, Franco; Santoro, Giuseppe Ernesto; Renato, Buzio; Andrea, Gerbi; Geetha, Balakrishnan; Alexis, Baratoff; Tosatti, Erio; Ernst, Meyer. - In: NATURE MATERIALS. - ISSN 1476-1122. - 13:2(2014), pp. 173-177. [10.1038/nmat3836]

Giant frictional dissipation peaks and charge-density-wave slips at the NbSe2 surf

Pellegrini, Franco;Santoro, Giuseppe Ernesto;Tosatti, Erio;
2014-01-01

Abstract

Understanding nanoscale friction and dissipation is central to nanotechnology(1-4). The recent detection of the electronicfriction 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 chargedensity 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 2 pi 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.
2014
13
2
173
177
http://cdsads.u-strasbg.fr/abs/2014NatMa..13..173L
http://www.nature.com/nmat/journal/v13/n2/full/nmat3836.html
Markus, Langer; Marcin, Kisiel; Remy, Pawlak; Pellegrini, Franco; Santoro, Giuseppe Ernesto; Renato, Buzio; Andrea, Gerbi; Geetha, Balakrishnan; Alexi...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/15044
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