Nanofriction of adsorbed monolayers on superconducting lead

M. Pierno; L. Bruschi; G. Mistura; C. Boragno; F. Buatier de Mongeot; U. Valbusa; C. Martella

doi:10.1103/PhysRevB.84.035448

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Nanofriction of adsorbed monolayers on superconducting lead

M. Pierno, L. Bruschi, G. Mistura, C. Boragno, F. Buatier de Mongeot, U. Valbusa, C. Martella

DOI 10.1103/PhysRevB.84.035448 · Physical Review B

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Abstract

With a quartz crystal microbalance (QCM) we have studied the nanofriction of neon and other simple gases deposited on lead at low temperature. Special care has been paid to the investigation of some artifacts in the QCM response encountered after the initial cooldown. Extensive results obtained with QCMs that have been thermally annealed confirm that Ne films slide on Pb below 10 K. However, no extra dissipation is observed when the Pb electrode is driven either magnetically or thermally into the metallic state. This means that the electronic contribution to friction is negligible for this system, probably, because of the small polarizability of Ne atoms. More polarizable adsorbates like N2, Kr, and Xe are instead found to be completely pinned to Pb below 10 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	onset