title: Anomalous Damping of a Microelectromechanical Oscillator in Superfluid ^{3}He-B.
abstract: The mechanical resonance properties of a microelectromechanical oscillator with a gap of 1.25  μm was studied in superfluid ^{3}He-B at various pressures. The oscillator was driven in the linear damping regime where the damping coefficient is independent of the oscillator velocity. The quality factor of the oscillator remains low (Q≈80) down to 0.1T_{c}, 4 orders of magnitude less than the intrinsic quality factor measured in vacuum at 4 K. In addition to the Boltzmann temperature dependent contribution to the damping, a damping proportional to temperature was found to dominate at low temperatures. We propose a multiple scattering mechanism of the surface Andreev bound states to be a possible cause for the anomalous damping.
authors.affiliation: Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
authors.forename: P
authors.initials: P
authors.lastname: Zheng
authors.affiliation: Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
authors.forename: W G
authors.initials: WG
authors.lastname: Jiang
authors.affiliation: Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
authors.forename: C S
authors.initials: CS
authors.lastname: Barquist
authors.affiliation: Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Lee
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: H B
authors.initials: HB
authors.lastname: Chan