Annealing Effect for Supersolid Fraction in $^4$He
A. Penzev, Y. Yasuta, M. Kubota
TL;DR
This paper confirms the existence of non-classical rotational inertia in solid helium and investigates how annealing affects the supersolid fraction, revealing a 10% increase after specific thermal treatment.
Contribution
It provides experimental evidence on the annealing effect on supersolid fraction in solid helium, highlighting differences from previous low-pressure studies.
Findings
Annealing at 1.8 K for 12 hours increases NCRI fraction by about 10%.
Repeated annealing saturates the NCRI enhancement.
The observed NCRI onset occurs below approximately 400 mK.
Abstract
We report on experimental confirmation of the non-classical 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 m/sec. After an additional annealing of the sample at 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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