固体氦中的电荷运动

IF 1.1 3区 物理与天体物理 Q4 PHYSICS, APPLIED
A. I. Golov, V. B. Efimov, A. A. Levchenko, L. P. Mezhov-Deglin
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引用次数: 0

摘要

我们概述并讨论了在理解离子在固体氦中的运动方面取得的若干进展。固态氦中的正离子和负离子是嵌入主晶格内部结构的微观复合体。在氦同位素(\(^3\)He 和\(^4\)He)的 bcc 和 hcp 晶体中,它们的低场迁移率通常会随着冷却而降低。根据固态氦的密度(以及 hcp \(^4\)He 中正离子的晶体取向),两种离子迁移的相应活化能可能重合也可能不重合,它们通常等于空位产生能或大约是空位产生能的两倍。在强电场中,离子漂移速度与电场的关系通常是非线性但单调的。然而,对于 hcp \(^4\)He 中的正离子,我们观察到漂移速度的温度依赖性和场依赖性都存在非单调异常。我们在亚历山大-安德烈耶夫(Alexander Andreev)及其合作者提出的低能空穴子非弹性散射离子运动理论的框架内讨论了这些特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Charge Motion in Solid Helium

Charge Motion in Solid Helium

We overview and discuss several advances in the understanding of the motion of ions through solid helium. Positive and negative ions in solid helium are microscopic complexes with internal structures embedded into the host crystal lattice. Their low-field mobilities normally decrease with cooling in both bcc and hcp crystals of either isotope of helium (\(^3\)He and \(^4\)He). Depending on the density of solid helium (as well as, in the case of positive ions in hcp \(^4\)He, on the crystal orientation), the corresponding activation energies for the mobility of the two species of ions may or may not coincide, and they are found to be typically either equal to or about twice the vacancy creation energy. In strong electric fields, the field dependence of the drift velocity of ions is often nonlinear but monotonic. However, for positive ions in hcp \(^4\)He, non-monotonic anomalies in both temperature and field dependences of the drift velocity were observed. We discuss these features within the framework of the theory of ion motion via inelastic scattering of low-energy vacancions put forward by Alexander Andreev and co-workers.

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来源期刊
Journal of Low Temperature Physics
Journal of Low Temperature Physics 物理-物理:凝聚态物理
CiteScore
3.30
自引率
25.00%
发文量
245
审稿时长
1 months
期刊介绍: The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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