Observation of superflow in solid helium

E. Kim, M. H.W. Chan

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)1941-1944
Number of pages4
JournalScience
Volume305
Issue number5692
DOIs
Publication statusPublished - Sep 24 2004

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Kim, E., & Chan, M. H. W. (2004). Observation of superflow in solid helium. Science, 305(5692), 1941-1944. https://doi.org/10.1126/science.1101501