Metal-insulator transition at 50 K inNa2C60 | Zendy

Yoshihiro Kubozono | Zendy; Yasuhiro Takabayashi | Zendy; Satoshi Fujiki | Zendy; Setsuo Kashino | Zendy; Takashi Kambe | Zendy; Yoshihiro Iwasa | Zendy; Shūichi Emura | Zendy

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Metal-insulator transition at 50 K inNa2C60

Author(s) -

Yoshihiro Kubozono,

Yasuhiro Takabayashi,

Satoshi Fujiki,

Setsuo Kashino,

Takashi Kambe,

Yoshihiro Iwasa,

Shūichi Emura

Publication year - 1999

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.59.15062

Subject(s) - physics , condensed matter physics , metal , crystallography , raman spectroscopy , center (category theory) , materials science , atomic physics , chemistry , quantum mechanics , metallurgy

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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