Charge Fluctuation in A_3C_<60>(A=K and Rb) : Competition Between Electron-Electron and Electron-Phonon Interactions : Condensed Matter: Electronic Properties, etc.

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We show that charge fluctuation occurs in A_3C_<60> due t,o 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 A_3C_<60> 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.
社団法人日本物理学会の論文
2001-02-15