Temperature dependence of nanoscale friction for Fe on YBCO

Abstract

A magnetic probe microscopy study of levitation and atomic-scale friction is reported for Fe on YBCO (Tc = 92.5 K) in the temperature range 65–293 K. Below Tc, the friction coefficient is constant and exhibits no correlation with the strength of superconducting levitation forces. Above Tc, the friction coefficient increases progressively, and nearly doubles between Tc and room temperature. The results are discussed within the context of the underlying atomic-scale electronic and phononic mechanisms that give rise to friction, and it is concluded that contact electrification and static electricity may play a significant role in the non-superconducting phase. Given that the properties of YBCO can be finely tuned, the results point the way to a variety of interesting studies of friction and superconductors.

Single-asperity sliding friction across the superconducting phase transition

“…Most of them center around the idea that a sliding tip or sliding adsorbates can drive charges through surface atomic layers experiencing electrical resistance, i.e., joules dissipation by ef fects like scattering and electron hole pair creation (1,(12)(13)(14). More recently, in addition, energy dissipation mechanisms based on elec trostatic interaction due to charge trapping have been suggested (15,16), while even a link between electronic and phononic effects may exist on the basis of electronphonon coupling (17,18). If the material resis tivity approaches zero, as is the case for a superconductor below T c , this electronic friction should vanish as well.…”

“…Later on, mea surements from the same group reported an even larger friction drop of 50% for N 2 and He films on superconducting Pb substrate (20). Those results have sparked considerable interest into the problems of electronic friction and spurred a number of different theoretical and experimental works later on (7,12,13,16,(21)(22)(23)(24). More recently, non contact friction experiments have demonstrated that the damping of an oscillating cantilever decreases strongly when crossing the super conducting phase transition temperature of Nb (25).…”

Friction coefficient dependence on electrostatic tribocharging

“…Park et al78 studied the electronic contributions to friction in silicon pn junctions and Qi et al9 examined GaAs, while Altfeder and Krim10 studied levitation and atomic-scale friction of Fe on YBCO by magnetic force microscopy. They discussed the results considering the underlying atomic-scale electronic and phononic mechanisms that give rise to friction and the later concluded “that contact electrification and static electricity may play a significant role in the non-superconducting phase”.…”

“…Current work on friction acknowledges a number of surface composition (including adsorbed layers21), morphology, environment, geometry22 and other factors on friction coefficients. Great progress in this direction was obtained thanks to the introduction of scanning probe techniques that led to progress in relating surface molecular features to friction coefficients, in the nanoscale678910112324. To achieve control of the charging state of the surface, this work is often done on samples immersed in aqueous solutions25 that is adequate from the fundamental point of view but is not relevant to dry insulator surfaces.…”

Single-file mobility of water-like fluid in a generalized Frenkel-Kontorova model

“…[41][42][43][44][45][46] To answer this question several and beautiful arranges were developed (from experimental perspective), even systems on superconducting state were analyzed. 36,47 From theoretical perspective almost all work was address by molecular dynamics simulation using a generalized Frenkel-Kotorova (FK) model as a paradigm. [37][38][39]48,49 Our aim in this work is to study the relation between confined water mobility and the CNT topology.…”