000061651 001__ 61651 000061651 005__ 20190709135429.0 000061651 0247_ $$2doi$$a10.1103/PhysRevLett.118.246101 000061651 0248_ $$2sideral$$a99680 000061651 037__ $$aART-2017-99680 000061651 041__ $$aeng 000061651 100__ $$0(orcid)0000-0003-0698-6555$$aMazo, J.J.$$uUniversidad de Zaragoza 000061651 245__ $$aTime Strengthening of Crystal Nanocontacts 000061651 260__ $$c2017 000061651 5060_ $$aAccess copy available to the general public$$fUnrestricted 000061651 5203_ $$aWe 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. 000061651 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E19$$9info:eu-repo/grantAgreement/ES/MINECO/FIS2014-55867-P 000061651 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/ 000061651 590__ $$a8.839$$b2017 000061651 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b6 / 78 = 0.077$$c2017$$dQ1$$eT1 000061651 592__ $$a3.622$$b2017 000061651 593__ $$aPhysics and Astronomy (miscellaneous)$$c2017$$dQ1 000061651 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000061651 700__ $$aDietzel, D. 000061651 700__ $$aSchirmeisen, A. 000061651 700__ $$aVilhena, J.G. 000061651 700__ $$aGnecco, E. 000061651 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada 000061651 773__ $$g118, 24 (2017), 246101[5 pp]$$pPhys. rev. lett.$$tPhysical Review Letters$$x0031-9007 000061651 8564_ $$s405045$$uhttps://zaguan.unizar.es/record/61651/files/texto_completo.pdf$$yVersión publicada 000061651 8564_ $$s129948$$uhttps://zaguan.unizar.es/record/61651/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000061651 909CO $$ooai:zaguan.unizar.es:61651$$particulos$$pdriver 000061651 951__ $$a2019-07-09-11:31:19 000061651 980__ $$aARTICLE