61651 20190709135429.0 doi 10.1103/PhysRevLett.118.246101 sideral 99680 ART-2017-99680 eng (orcid)0000-0003-0698-6555 Mazo, J.J. Universidad de Zaragoza Time Strengthening of Crystal Nanocontacts 2017 Access copy available to the general public Unrestricted We demonstrate how an exponentially saturating increase of the contact area between a nanoasperity and a crystal surface, occurring on time scales governed by the Arrhenius equation, is consistent with measurements of the static friction and lateral contact stiffness on a model alkali-halide surface at different temperatures in ultrahigh vacuum. The "contact ageing" effect is attributed to atomic attrition and is eventually broken by thermally activated slip of the nanoasperity on the surface. The combination of the two effects also leads to regions of strengthening and weakening in the velocity dependence of the friction, which are well-reproduced by an extended version of the Prandtl-Tomlinson model. info:eu-repo/grantAgreement/ES/DGA/E19 info:eu-repo/grantAgreement/ES/MINECO/FIS2014-55867-P info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 8.839 2017 PHYSICS, MULTIDISCIPLINARY 6 / 78 = 0.077 2017 Q1 T1 3.622 2017 Physics and Astronomy (miscellaneous) 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Dietzel, D. Schirmeisen, A. Vilhena, J.G. Gnecco, E. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 118, 24 (2017), 246101[5 pp] Phys. rev. lett. Physical Review Letters 0031-9007 405045 http://zaguan.unizar.es/record/61651/files/texto_completo.pdf Versión publicada 129948 http://zaguan.unizar.es/record/61651/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:61651 articulos driver 2019-07-09-11:31:19 ARTICLE