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

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.

4 pages, 3 figures

References in corpus (4)

• Nonclassical Rotational Inertia in Single Crystal Helium
• The effect of 3He impurities on the nonclassical response to oscillation of solid 4He
• Heat capacity peak in solid 4He: Effects of disorder and 3He impurities
• A glass anomaly in the shear modulus of solid ${}^4$He

Cited by in corpus (5)

• Absence of supersolidity in solid helium in porous Vycor glass
• Upper limit of supersoldity in solid helium
• Frequency-dependent Study of Solid Helium-4 Contained in a Rigid Double-torus Torsional Oscillator
• Simultaneous investigation of shear modulus and torsional resonance of solid 4He
• Saga of Superfluid Solids