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Pressure For Change In Metals

机译:金属变化的压力

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摘要

When is a metal not a metal? When it is under high pressure, if it's lithium or sodium. The strange behaviour of dense forms of these elements exposes difficulties with commonly used models of electronic structure. The physical laws that govern the behaviour of individual particles of matter can be relatively simple compared with the difficulties of understanding systems that contain large numbers of them. Yet such difficulties must be overcome if one is to understand the subtle quantum physics of the condensed states of matter. So-called simple metals, such as lithium and sodium, have had a pivotal role in studies of metallic solids, because their electronic behaviour is plausibly described using an approximation known as the nearly-free electron model. But two reports in this issue reveal that lithium and sodium do something quite remarkable under pressure that can't readily be explained by this approximation -they adopt semiconductor-like forms.
机译:什么时候金属不是金属?在高压下,如果是锂或钠。这些元素的密集形式的奇怪行为暴露了常用的电子结构模型的困难。与理解包含大量粒子的系统的困难相比,控制物质单个粒子行为的物理定律可以相对简单。然而,如果要了解物质凝聚态的微妙量子物理学,就必须克服这些困难。所谓的简单金属,例如锂和钠,在金属固体的研究中起着举足轻重的作用,因为它们的电子行为可以用近似自由电子模型来描述。但是,此期的两份报告显示,锂和钠在压力下的作用相当显着,无法通过这种近似来轻松解释-它们采用类似半导体的形式。

著录项

  • 来源
    《Nature》 |2009年第7235期|p.158-159|共2页
  • 作者

    N.W.Ashcroft;

  • 作者单位

    Department of Electrical Engineering, and the Engineering Research Center for Mid-InfraRed Technologies for Health and the Environment, Princeton University, Princeton, New Jersey 08544, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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