We have measured photoemission and inverse-photoemission spectra of the ferromagnetic metal (Formula presented) The observed Ru (Formula presented)-derived conduction band above and below the Fermi level (Formula presented) is found to be widely spread and the emission intensity at (Formula presented) to be weakened compared to band-structure calculations. Here, the calculations have been made for the ferromagnetic state with the actual distorted perovskite structure. We compare the spectra with the spectral density of states (DOS) obtained by modifying the band DOS with a phenomenological self-energy correction, which is chosen to be compatible with the measured electronic specific heat coefficient (Formula presented) Although the mass enhancement factor is only moderately large, (Formula presented) the renormalization factor Z is found to be as small as (Formula presented) (Formula presented) These indicate a significant momentum dependence of the self-energy and a highly incoherent metallic state in (Formula presented) We have also compared the photoemission and inverse-photoemission spectra taken below and above the Curie temperature, but significant changes have not been identified.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 1999|
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