Temperature-Dependent Pinning or Depinning of a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:math>Overlayer in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts><mml:mtext mathvariant="normal">−</mml:mtext><mml:mmultiscripts><mml:mi>He</m

Oda, T; Hieda, Mitsunori

doi:10.1103/physrevlett.111.106101

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…These ndings are consistent with previous studies at low T reporting complete pinning of the highly polarizable N 2 , Ar, Kr and Xe and sliding of the weakly polarizable Ne, 4 He and 3 He on different surfaces. 26,[29][30][31][32][33] At T ¼ 35 K, the lm is pinned to the surface when the Xe coverage is very low but starts to slide for Q > 0.45 ML. As the temperature is further increased, s s increases monotonically while the depinning onset coverage, Q dep , beyond which the lm starts to slide, decreases progressively.…”

Section: Resultsmentioning

confidence: 99%

Thermolubricity of gas monolayers on graphene

et al. 2014

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The nanofriction of Xe monolayers deposited on graphene was explored with a quartz crystal microbalance (QCM) at temperatures between 25 and 50 K. Graphene was grown by chemical vapor deposition and transferred to the QCM electrodes with a polymer stamp. At low temperatures, the Xe monolayers are fully pinned to the graphene surface. Above 30 K, the Xe film slides and the depinning onset coverage beyond which the film starts sliding decreases with temperature. Similar measurements repeated on bare gold show an enhanced slippage of the Xe films and a decrease of the depinning temperature below 25 K. Nanofriction measurements of krypton and nitrogen confirm this scenario.This thermolubric behavior is explained in terms of a recent theory of the size dependence of static friction between adsorbed islands and crystalline substrates. Since its discovery, graphene has been found to possess numerous outstanding properties such as extreme mechanical strength, extraordinarily high electronic and thermal conductivity, thus opening the way to a plethora of possible applications [1]. In particular, the tribological features of graphene have received increasing attention in view of the development of graphene-based coatings [2]. Graphite is a well-known solid lubricant, used in many practical applications. Its nanofriction behavior has been investigated mainly by frictional force microscopy [3][4][5]. Measurements on few-layer graphene and single-layer graphene, prepared by micromechanical cleaving on weakly adherent substrates, have revealed that friction monotonically increases as the number of layers decreases [2,6,7], while, surprisingly, recent studies showed that this tendency is inverted when graphene is suspended [8].Here we present the results of a quartz crystal microbalance (QCM) study mainly focused on the sliding of Xe monolayers on graphene (Gr) between 20 and 50 K, a temperature range which has been scarcely investigated in the literature [9], despite its relevance for the formation of condensed two-dimensional phases of many simple gases [10]. In our approach, the gold electrodes of a QCM were covered with Gr because the ample availability of phase diagrams of noble gases monolayers adsorbed on graphite [10] facilitates the interpretation of the QCM sliding measurements [11,12].In previous QCM experiments Gr was grown epitaxially on a Ni(111) QCM electrode by heating the QCM to 400 • C in the presence of carbon monoxide [13,14].

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Section: Resultsmentioning

confidence: 99%

Thermolubricity of gas monolayers on graphene

et al. 2014

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Reentrant pinning of a He3 overlayer in a He3−He4
Okamura
¹
,
Taniguchi
²
,
Hieda
³

et al. 2019
Phys. Rev. B
1
0
0
0
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Monte Carlo simulations of theXYvectorial Blume-Emery-Griffiths model in multilayer films forHe3−He4

Santos-Filho

Plascak

2017

Phys. Rev. E

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The XY vectorial generalization of the Blume-Emery-Griffiths (XY-VBEG) model, which is suitable to be applied to the study of ^{3}He-^{4}He mixtures, is treated on thin films structure and its thermodynamical properties are analyzed as a function of the film thickness. We employ extensive and up-to-date Monte Carlo simulations consisting of hybrid algorithms combining lattice-gas moves, Metropolis, Wolff, and super-relaxation procedures to overcome the critical slowing down and correlations among different spin configurations of the system. We also make use of single histogram techniques to get the behavior of the thermodynamical quantities close to the corresponding transition temperatures. Thin films of the XY-VBEG model present a quite rich phase diagram with Berezinskii-Kosterlitz-Thouless (BKT) transitions, BKT endpoints, and isolated critical points. As one varies the impurity concentrations along the layers, and in the limit of infinite film thickness, there is a coalescence of the BKT transition endpoint and the isolated critical point into a single, unique tricritical point. In addition, when mimicking the behavior of thin films of ^{3}He-^{4}He mixtures, one obtains that the concentration of ^{3}He atoms decreases from the outer layers to the inner layers of the film, meaning that the superfluid particles tend to locate in the bulk of the system.

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Temperature-Dependent Pinning or Depinning of aHe3Overlayer in aHe3−He

Cited by 3 publications

References 33 publications

Thermolubricity of gas monolayers on graphene

Thermolubricity of gas monolayers on graphene

Reentrant pinning of a He3 overlayer in a He3−He4
Okamura
¹
,
Taniguchi
²
,
Hieda
³

et al. 2019
Phys. Rev. B
1
0
0
0
View full text Add to dashboard Cite

Monte Carlo simulations of theXYvectorial Blume-Emery-Griffiths model in multilayer films forHe3−He4

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Temperature-Dependent Pinning or Depinning of aHe3Overlayer in aHe3−He

Cited by 3 publications

References 33 publications

Thermolubricity of gas monolayers on graphene

Thermolubricity of gas monolayers on graphene

Reentrant pinning of a He3 overlayer in a He3−He4Okamura1, Taniguchi2, Hieda3 et al. 2019Phys. Rev. B1000View full textAdd to dashboardCite

Monte Carlo simulations of theXYvectorial Blume-Emery-Griffiths model in multilayer films forHe3−He4

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Resources

About

Reentrant pinning of a He3 overlayer in a He3−He4
Okamura
¹
,
Taniguchi
²
,
Hieda
³

et al. 2019
Phys. Rev. B
1
0
0
0
View full text Add to dashboard Cite