Phys. Rev. Lett. 80, 1690–1693 (1998)Superconductivity-Dependent Sliding FrictionReceived 29 September 1997; published in the issue dated 23 February 1998 We have employed a quartz crystal microbalance technique to measure the friction associated with sliding of solid nitrogen along a lead surface, above and below the lead's superconducting transition temperature. The friction is observed to drop abruptly at the transition as the substrate enters the superconducting state. The observation signifies a new phenomenon, most likely attributable to electronic contributions to friction. While such contributions have been discussed and debated theoretically for a number of years, they have heretofore not been observed in any direct experimental fashion. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.1690
DOI:
10.1103/PhysRevLett.80.1690
PACS:
68.45.Nj, 46.30.Pa, 67.70.+n, 74.25.-q
See AlsoComment: R. L. Renner, J. E. Rutledge, and P. Taborek, Quartz Microbalance Studies of Superconductivity-Dependent Sliding Friction, Phys. Rev. Lett. 83, 1261 (1999). Reply: J. Krim, Krim Replies:, Phys. Rev. Lett. 83, 1262 (1999). |
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