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ID 34146
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Author
Kubozono, Y.
Takabayashi, Y.
Fujiki, S.
Kashino, S.
Kambe, T.
Iwasa, Y.
Emura, S.
Abstract

Temperature dependence of electron spin resonance in Na2C60 was studied in a temperature range from 2 to 350 K. It was shown that Na2C60 was metallic above 50 K and had a metal-insulator transition at 50 K. The center frequency for the Hg(2) Raman mode in Na2C60 at 298 K was close to those in the metallic Rb3C60, K3C60, and Cs3C60, while the linewidth was close to that in the metallic but nonsuperconducting Cs3C60. The Hg(2) mode showed a large blueshift and narrowing at 50 K. The center frequency and the linewidth in the low-temperature region from 50 K were almost the same as those in the insulating C-60 and Rb6C60, which showed the metal-insulator transition at 50 K in Na2C60. The origin of this metal-insulator transition was discussed in terms of the electron-phonon interaction (Jahn-Teller effect) and the electron-electron interaction (Mott-Hubbard picture). [S0163-1829(99)04123-5].

Note
Published with permission from the copyright holder.
This is the institute's copy, as published in Physical Review B, June 1999, Volume 59, Issue 23, 15062-15069.
Publisher URL: http://dx.doi.org/10.1103/PhysRevB.59.15062
Direct access to Thomson Web of Science record
Copyright © 1999 The American Physical Society. All rights reserved.
Published Date
1999-6
Publication Title
Physical Review B
Volume
volume59
Issue
issue23
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
physics_general/39