固体$^4$ He中高温无序诱导迁移率的证据
Evidence for a High-Temperature Disorder-Induced Mobility in Solid $^4$He
摘要：
我们在1.3 - 1.9K温度范围内对固体$^4$ He进行了扭振子实验。我们发现的现象类似于在0.2K以下的温度下观察到的现象，目前正在讨论它们在超固体方面的解释。这些现象包括从振荡器的固体氦质量的部分解耦，耗散的变化，以及解耦质量的速度依赖性。这些都在固态$^4$ He的bcc相和hcp相中观察到。这种行为的发生与晶体无序的产生是巧合的，但并不强烈依赖于晶体的对称性或温度。
英文摘要：
We have carried out torsional oscillator experiments on solid $^4$He at temperatures between 1.3K and 1.9K. We discovered phenomena similar to those observed at temperatures below 0.2K, which currently are under debate regarding their interpretation in terms of supersolidity. These phenomena include a partial decoupling of the solid helium mass from the oscillator, a change of the dissipation, and a velocity dependence of the decoupled mass. These were all observed both in the bcc and hcp phases of solid $^4$He. The onset of this behavior is coincidental with the creation of crystalline disorder but does not depend strongly on the crystalline symmetry or on the temperature.
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