Simultaneous Measurements of the Torsional Oscillator Anomaly and Thermal Conductivity in Solid 4He
Abstract
In these torsional oscillator experiments the samples of solid 4He were characterized by measuring their thermal conducitvity. Polycrystalline samples of helium of either high isotopic purity or natural concentration of 3He were grown in an annular container by the blocked-capillary method and investigated before and after annealing. No correlation has been found between the magnitude of the low-temperature shift of the torsional oscillator frequency and the amount of crystalline defects as measured by the thermal conductivity. In samples with the natural 3He concentration a substantial excess thermal conductivity over the usual T3 dependence was observed below 120 mK.
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