3He film flow on a round rim beaker

摘要: The superfluid properties of thin (100–150 nm) of3He were investigated by measuring the rate at which a beaker liquid3He emptied itself through adsorbed film, with film thickness δ decreasing as level dropped. A rim semicircular cross-section was used to provide well defined geometry and avoid effects small scratches that may have affected earlier experiments. thicknesses determined Atkins' oscillaton measurements of4He films on same surface. transition temperature in filmTcF suppressed below bulk valueTcB, close being described 2δ/ξ(TcF) = π, expected for A-phase. critical current density more than an order magnitude smaller pair-breaking. When a4He monolayer substrate, there no suppresson ofTcF.