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arXiv · 1104.4555

Simultaneous Measurements of the Torsional Oscillator Anomaly and Thermal Conductivity in Solid 4He

D. E. Zmeev·A. I. Golov
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Abstract

In these torsional oscillator experiments the samples of solid $^4$He were characterized by measuring their thermal conducitvity. Polycrystalline samples of helium of either high isotopic purity or natural concentration of $^3$He 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 $^3$He concentration a substantial excess thermal conductivity over the usual $T^3$ dependence was observed below 120 mK.

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D. E. Zmeev, A. I. Golov. 2011-07-09. Simultaneous Measurements of the Torsional Oscillator Anomaly and Thermal Conductivity in Solid 4He. https://doi.org/10.1103/physrevlett.107.065302

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