在ISIS中子散射实验中寻找超固体~ 4 He
Search for supersolid 4He in neutron scattering experiments at ISIS
摘要：
用M. Chan和E.金引起了人们极大的兴趣，因为它可能是超固态物质的一种表现。尽管许多实验和理论研究受到这一观察的启发，但对这一现象的明确解释仍然缺失。固体中子散射实验可能有助于阐明NCRI的物理基础，并回答这种现象是否由玻色-爱因斯坦凝聚引起的问题。本文将讨论中子在固体~ 4 He上散射的实验结果。在70 mK - 500 mK温度范围内，首次获得了氦原子的平均动能、均方动量、均方位移和晶格常数等微观定量数据。单原子动能在统计误差小于1%的范围内没有变化，晶格参数在0.03%的范围内没有变化，均方位移在预期的超固态转变区域也没有变化。这些结果表明，NCRI相变与4 He超流相变有很大的不同。
英文摘要：
The observation of a non-classical rotation inertia (NCRI) fraction in bulk solid 4He by M. Chan and E. Kim attracted significant interest as a possible manifestation of supersolid state of matter. Despite numerous experimental and theoretical studies inspired by this observation, an explicit explanation for this phenomenon is still missing. Neutron scattering experiments on solid elium may help to shed light on the physical grounds of NCRI and answer the question on whether this phenomenon could be caused by Bose-Einstein Condensation. In this paper we are going to discuss the results obtained in experiments involving neutron scattering on solid 4He. Microscopic quantitative data such as mean kinetic energy, mean square momentum and mean square displacement of helium atoms as well as the lattice parameter have been obtained for the first time for solid 4He in temperature range 70 mK - 500 mK. No change was seen in the single atom kinetic energy within statistical error better than 1per cent as well as change in the lattice parameter within 0.03 per cent. The mean square displacement did not change in the region of expected supersolid transition either. All these results suggest that the NCRI transition is quite different from the superfluid transition in liquid 4He.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
