Oscillation Frequency Dependence of Non-Classical Rotation Inertia of Solid ${}^4$He

Y. Aoki, J. C. Graves, H. Kojima

The non-classical rotational inertia fraction of the identical cylindrical solid ${}^4$He below 300 mK is studied at 496 and 1173 Hz by a double resonance torsional oscillator. Below…