Journal
NATURE
Volume 458, Issue 7235, Pages 186-189Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature07827
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Funding
- Grant-in-Aid for Scientific Research [19104009]
- Global COE Program Core Research and Engineering of Advanced Materials-Interdisciplinary Education Center for Materials Science), MEXT, Japan
- Grant-in-Aid for JSPS Fellows [19.52753]
- Grants-in-Aid for Scientific Research [19104009] Funding Source: KAKEN
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Lithium, the lightest metal, has long been considered to have a 'simple' electronic structure that can be well explained within the nearly-free-electron model. But lithium does not stay 'simple' under compression: rather than becoming more free-electron-like as pressure is increased, first-principles calculations(1,2) suggest that it transforms into a semi-metal or semiconductor. Experimentally, it has been shown that dense lithium adopts low-symmetry structures(3,4); there is also evidence that its resistivity increases with pressure(5-8). However, the electronic transport properties of lithium have so far not been directly monitored as a function of increasing static pressure. Here we report electrical resistance measurements on lithium in a diamond anvil cell up to pressures of 105 GPa, which reveal a significant increase in electrical resistivity and a change in its temperature dependence near 80 GPa. Our data thus provide unambiguous experimental evidence for a pressure-induced metal-to-semiconductor transition in a 'simple' metallic element.
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