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Kubozono, Y. Department of Chemistry, Okayama University
Takabayashi, Y. Department of Chemistry, Okayama University
Fujiki, S. Department of Chemistry, Okayama University
Kashino, S. Department of Chemistry, Okayama University
Kambe, T. Department of Physics, Okayama University
Iwasa, Y. Japan Advanced Institute of Science and Technology
Emura, S. ISIR, Osaka University
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].
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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
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Copyright © 1999 The American Physical Society. All rights reserved.
Physical Review B
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