title: Nonclassical rotational inertia in helium crystals.
abstract: It has been proposed that the observed nonclassical rotational inertia (NCRI) in solid helium results from the superflow of thin liquid films along interconnected grain boundaries within the sample. We have observed NCRI in large (4)He crystals grown at constant temperature and pressure, demonstrating that the superfluid grain boundary model cannot explain the phenomenon.
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA. acc172@psu.edu
authors.forename: A C
authors.initials: AC
authors.lastname: Clark
authors.forename: J T
authors.initials: JT
authors.lastname: West
authors.forename: M H W
authors.initials: MH
authors.lastname: Chan