title: Anomalous attenuation of transverse sound in 3He.
abstract: We present the first measurements of the attenuation of transverse sound in superfluid 3He-B. We use fixed path length interferometry combined with the magnetoacoustic Faraday effect to vary the effective path length by a factor of 2, resulting in absolute values of the attenuation. We find that attenuation is significantly larger than expected from the theoretical dispersion relation, in contrast with the phase velocity of transverse sound. We suggest that the anomalous attenuation can be explained by surface Andreev bound states.
authors.affiliation: Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Davis
authors.forename: J
authors.initials: J
authors.lastname: Pollanen
authors.forename: H
authors.initials: H
authors.lastname: Choi
authors.forename: J A
authors.initials: JA
authors.lastname: Sauls
authors.forename: W P
authors.initials: WP
authors.lastname: Halperin
authors.forename: A B
authors.initials: AB
authors.lastname: Vorontsov