2020年12月
Magnetic-field-induced insulator–metal transition in W-doped VO2 at 500 T
Nature Communications
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- 巻
- 11
- 号
- 1
- 開始ページ
- 3591
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41467-020-17416-w
- 出版者・発行元
- Springer Science and Business Media LLC
Metal-insulator (MI) transitions in correlated electron systems have long been a central and controversial issue in material science. Vanadium dioxide (VO2) exhibits a first-order MI transition at 340 K. For more than half a century, it has been debated whether electron correlation or the structural instability due to dimerised V ions is the more essential driving force behind this MI transition. Here, we show that an ultrahigh magnetic field of 500 T renders the insulator phase of tungsten (W)-doped VO2 metallic. The spin Zeeman effect on the d electrons of the V ions dissociates the dimers in the insulating phase, resulting in the delocalisation of electrons. As the Mott-Hubbard gap essentially does not depend on the spin degree of freedom, the structural instability is likely to be the more essential driving force behind the MI transition.
- リンク情報
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- DOI
- https://doi.org/10.1038/s41467-020-17416-w
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000552423000010&DestApp=WOS_CPL
- URL
- http://www.nature.com/articles/s41467-020-17416-w.pdf
- URL
- http://www.nature.com/articles/s41467-020-17416-w
- ID情報
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- DOI : 10.1038/s41467-020-17416-w
- ISSN : 2041-1723
- eISSN : 2041-1723
- Web of Science ID : WOS:000552423000010