ac vortex-dependent torsional oscillation response and onset temperature T(0) in solid (4)He

作者：Penzev Andrey^*; Yasuta Yoshinori; Kubota Minoru

来源：Physical Review Letters, 2008, 101(6): 065301.

DOI：10.1103/PhysRevLett.101.065301

Detailed studies of ac velocity V(ac) and T dependence of torsional oscillator responses of solid (4)He are reported. A characteristic onset temperature T(0) similar to 0.5 K is found, below which a significant V(ac)-dependent change occurs in the energy dissipation for the samples at similar to 32 bar and for one at 49 bar. A Vac dependence of the so-called "nonclassical rotational inertia'' fraction also appears below similar to T(0). The log (V(ac)) linear dependence, which suggests involvement of quantized vorticies, was examined in the nonclassical rotational inertia fraction. We find a common 1/T(2) dependence for this linear slope change in all of the samples for 30 < V(ac) < 300 mu m/s.

• 出版日期2008-8-8