Authors: Andrey Penzev Yoshinori Yasuta Minoru Kubota
Publish Date: 2007/06/07
Volume: 148, Issue: 5-6, Pages: 677-681
Abstract
We report on experimental confirmation of the nonclassical rotational inertia NCRI in solid helium samples originally reported by Kim and Chan The onset of NCRI was observed at temperatures below ≈400 mK The ac velocity for initiation of the NCRI suppression is estimated to be ≈10 μm/sec After an additional annealing of the sample at T=18 K for 12 hours ∼10 relative increase of NCRI fraction was observed Then after repeated annealing with the same conditions the NCRI fraction was saturated It differs from Reppy’s observation on a low pressure solid sample
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