低于固体4 He起始温度T_0的涡旋流体状态
Vortex Fluid State below an Onset Temperature T_0 of Solid 4He
摘要：
详细研究了固态~ 4 He扭转振子响应的交流速度Vac和温度依赖性。发现一个约0.5 K的特征起始温度T0，低于该温度时，样品在32 bar下的能量耗散发生显著的Vac依赖性变化。非经典转动惯量分数NCRIF的Vac依赖性也出现在约T0以下。这个T0值排除了超固体在晶界或其他液体相关起源中的液体超流性的可能解释。在NCRIF中发现log（Vac）线性依赖性。此外，对于40 < Vac < 400 μ m/s，该线性斜率与1/T 2成比例地变化，然后对于更大的Vac，该线性斜率跨越到约1/T。我们讨论了安德森提出的涡旋流体状态的性能高于Tc，低于T0。
英文摘要：
Detailed studies of AC velocity Vac and temperature dependence of torsional oscillator responses of solid 4He are reported. A characteristic onset temperature T0 about 0.5 K is found, below which a significant Vac dependent change occurs in the energy dissipation for the sample at 32 bar. A Vac dependence of the non-classical rotational inertia fraction, NCRIF also appears below about T0. This value of T0 excludes the possible explanation of supersolid by liquid superfluidity in grain boundaries or other liquid related origins. The log(Vac) linear dependence was found in NCRIF. Furthermore, this linear slope changes in proportion to 1/T 2 for 40 < Vac < 400 micro-m/s, then crosses over to about 1/T for larger Vac. We discuss properties of the vortex fluid state proposed by Anderson above Tc, below T0.
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