Effects ofHe3impurity on solidHe4studied by compound torsional oscillator
Effects ofHe3impurity on solidHe4studied by compound torsional oscillator
Frequency shifts and dissipation of a compound torsional oscillator induced by solid $^{4}\mathrm{He}$ samples containing $^{3}\mathrm{He}$ impurity concentrations (${x}_{3}$ $=$ 0.3, 3, 6, 12, and 25 in units of 10${}^{\ensuremath{-}6}$) have been measured at two resonant mode frequencies (${f}_{1}$ $=$ 493 and ${f}_{2}$ $=$ 1164 Hz) at temperatures ($T$) between …