Kim E, Chan M H W
Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
Science. 2004 Sep 24;305(5692):1941-4. doi: 10.1126/science.1101501. Epub 2004 Sep 2.
We report on the observation of nonclassical rotational inertia in solid helium-4 confined to an annular channel in a sample cell under torsional motion, demonstrating superfluid behavior. The effect shows up as a drop in the resonant oscillation period as the sample cell is cooled below 230 millikelvin. Measurement of 17 solid samples allows us to map out the boundary of this superfluid-like solid or supersolid phase from the melting line up to 66 bars. This experiment indicates that superfluid behavior is found in all three phases of matter.
我们报告了在扭摆运动下，对限制在样品池中环形通道内的固态氦-4的非经典转动惯量的观测，证明了超流行为。当样品池冷却至230毫开尔文以下时，该效应表现为共振振荡周期的下降。对17个固态样品的测量使我们能够描绘出这种类超流固态或超固态相从熔点到66巴的边界。该实验表明，在物质的所有三个相中都发现了超流行为。
