位错超攀与固体He4的反常等容压缩
Superclimb of Dislocations and the Anomalous Isochoric Compressibility of Solid He4
摘要：
在关于固体He 4中的超流传输的实验中[PRL { \bf 100}，235301（2008）]，Ray和Hallock观察到{ \it非常大的等容压缩性}：超固体样品表现出密度和压力对化学势的显著且明显空间均匀的响应，通过Vycor“电极”局部施加。我们认为这种效应是由于{ \it superclimb}造成的：由于沿着超流体核心的质量传输，边缘位错可以爬升。我们证实了{ \it从头计算}模拟的刃位错在固体氦4在$T=0.5K$的情况。我们认为，在低温下的效果必须被抑制，由于交叉到光滑的位错。
英文摘要：
In the experiment on superfluid transport in solid He4 [PRL {\bf 100}, 235301 (2008)], Ray and Hallock observed an {\it anomalously large isochoric compressibility}: the supersolid samples demonstrated a significant and apparently spatially uniform response of density and pressure to chemical potential, applied locally through Vycor "electrodes". We propose that the effect is due to {\it superclimb} : edge dislocations can climb because of mass transport along superfluid cores. We corroborate the scenario by {\it ab initio} simulations of an edge dislocation in solid He4 at $T=0.5K$. We argue that at low temperature the effect must be suppressed due to a crossover to the smooth dislocation.
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