Annealing in solid 4He
Abstract
We have used a torsional oscillator with square cross section and a resonance frequency of 185 Hz to confirm the nonclassical rotational inertia (NCRI) discovered by Kim and Chan1,2. We have also found a strong correlation between the NCRI signal and a high dissipation Q-1 of 4 × 10-6 of the oscillation above the transition temperature. Here, we present preliminary results of the annealing process in 4He at a pressure of 26 bar. When holding the temperature constant above 1 K we have observed a immediate rise in the period and a slow decay of the dissipation. The equilibrium value of Q-1 decreases with increasing temperature.
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