固态氦-4中拓扑缺陷的热性质和结构性质：从hcp到fc正交晶格的应变诱发马氏体相变
Thermal and structural properties of topological defects in solid Helium-4: Strain induced martensitic transformation from hcp to fc orthorhombic lattice
摘要：
一些实验研究已经报道了固体氦-4的机械响应的热激活行为，其不符合理想晶体中的热激活Frenkel对模型。本工作的目的是研究结构拓扑缺陷如何改变响应。本文用量子MonteCarlo蠕虫算法研究了含有几种位错的六角密排氦-4固体样品中粒子总数涨落的温度依赖性。这种涨落可用热激活定律来描述，其激活能强烈依赖于位错的类型和晶体密度。所提取的值覆盖从大约1 K到20 K的范围。研究还发现，一个jog-antijog对的湮灭可以产生一个局部区域的正交对称性的特点。这一偶然的观察结果表明，在10-15%的单轴应力下，六方晶系固体氦-4能发生位移相变，转变为正交晶系
英文摘要：
Several experimental studies have reported thermally activated behavior of the mechanical response of solid Helium-4 which does not fit into the model of thermally activated Frenkel pairs in an ideal crystal. The purpose of the present work is to investigate how structural topological defects modify the response. Using quantum Monte Carlo Worm Algorithm, we study temperature dependence of fluctuations of the total number of particles in samples of hcp solid Helium-4 containing several types of dislocations. Such fluctuations can be described by the thermal activation law with the activation energy dependent strongly on the type of the dislocation and the crystal density. The extracted values cover a range from about 1K to 20K. It is also found that annihilation of a jog-antijog pair can produce a local region of the solid characterized by the orthorhombic symmetry. This serendipitous observation suggests that hcp solid Helium-4 can undergo a displacive phase transition into the orthorhombic crystal under uniaxial stress of about 10-15%
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