Charge Fluctuation in A3C60 (A=K and Rb). Competition Between Electron-Electron and Electron-Phonon Interactions.

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  • Chida Tadahiko
    Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573
  • Suzuki Shugo
    Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573
  • Nakao Kenji
    Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573

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  • Charge Fluctuation in<i><i>A</i><sub><b>3</b></sub></i>C<sub><b>60</b></sub>(<i><i>A</i></i>=K and Rb): Competition Between Electron-Electron and Electron-Phonon Interactions

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We show that charge fluctuation occurs in A3C60 due to the competition between electron-electron and electron-phonon interactions and consequently the material remains metallic although both interactions are considerably strong. We calculate the spectral density for A3C60 based on the dynamical mean-field theory by using the exact diagonalization method. We find a satellite, which is a direct consequence of the charge fluctuation, at about 1.3 eV below the Fermi level. We point out that high-resolution photoemission experiments have shown the existence of this satellite.

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