Observation of non-classical rotational inertia in bulk solid 4He
arXiv:cond-mat/0607032 · doi:10.1007/s10909-007-9471-1
Abstract
In recent torsional oscillator experiments by Kim and Chan (KC), a decrease of rotational inertia has been observed in solid 4He in porous materials and in a bulk annular channel. This observation strongly suggests the existence of "non-classical rotational inertia" (NCRI), i.e. superflow, in solid 4He. In order to study such a possible "supersolid" phase, we perform torsional oscillator experiments for cylindrical solid 4He samples. We have observed decreases of 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.
6 pages, 3 firures, submitted to J. Low Temp. Phys. (Proceedings of QFS2006)
References in corpus (1)
Cited by in corpus (63)
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