Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 148, Issue 5-6, Pages 695-699Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-007-9471-1
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In recent torsional oscillator experiments by Kim and Chan (KC), a decrease of rotational inertia has been observed in solid He-4 in porous materials (Kim, E., Chan, M.H.W. in Nature 427:225, 2004; J. Low Temp. Phys. 138:859, 2005) and in a bulk annular channel (Kim, E., Chan, M.H.W. in Science 305:1941, 2004). This observation strongly suggests the existence of non-classical rotational inertia (NCRI), i.e. superflow, in solid He-4. In order to study such a possible supersolid phase, we perform torsional oscillator experiments for cylindrical solid He-4 samples. We have observed decreases in rotational inertia below 200 mK for two solid samples (pressures P=4.1 and 3.0 MPa). The observed NCRI fraction at 70 mK is 0.14%, which is about 1/3 of the fraction observed in the annulus by KC. Our observation is the first experimental confirmation of the possible supersolid finding by KC.
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