Correlation effects in the electronic structure of SrRuO3

J. Okamoto, Takashi Mizokawa, A. Fujimori, I. Hase, M. Nohara, H. Takagi, Y. Takeda, M. Takano

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Abstract

We have measured photoemission and inverse-photoemission spectra of the ferromagnetic metal SrRuO3. The observed Ru 4d-derived conduction band above and below the Fermi level (EF) is found to be widely spread and the emission intensity at EF 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 γ. Although the mass enhancement factor is only moderately large, ∼4.4, the renormalization factor Z is found to be as small as ∼0.08 (Z-1∼13). These indicate a significant momentum dependence of the self-energy and a highly incoherent metallic state in SrRuO3. We have also compared the photoemission and inverse-photoemission spectra taken below and above the Curie temperature, but significant changes have not been identified.

Original languageEnglish
Pages (from-to)2281-2285
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number4
Publication statusPublished - 1999 Jul 15
Externally publishedYes

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Photoemission
Electronic structure
photoelectric emission
electronic structure
Ferromagnetic materials
Spectral density
Curie temperature
Fermi level
Conduction bands
Band structure
Perovskite
Specific heat
Momentum
conduction bands
specific heat
momentum
energy
augmentation
coefficients
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Okamoto, J., Mizokawa, T., Fujimori, A., Hase, I., Nohara, M., Takagi, H., ... Takano, M. (1999). Correlation effects in the electronic structure of SrRuO3. Physical Review B - Condensed Matter and Materials Physics, 60(4), 2281-2285.

Correlation effects in the electronic structure of SrRuO3. / Okamoto, J.; Mizokawa, Takashi; Fujimori, A.; Hase, I.; Nohara, M.; Takagi, H.; Takeda, Y.; Takano, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 60, No. 4, 15.07.1999, p. 2281-2285.

Research output: Contribution to journalArticle

Okamoto, J, Mizokawa, T, Fujimori, A, Hase, I, Nohara, M, Takagi, H, Takeda, Y & Takano, M 1999, 'Correlation effects in the electronic structure of SrRuO3', Physical Review B - Condensed Matter and Materials Physics, vol. 60, no. 4, pp. 2281-2285.
Okamoto J, Mizokawa T, Fujimori A, Hase I, Nohara M, Takagi H et al. Correlation effects in the electronic structure of SrRuO3. Physical Review B - Condensed Matter and Materials Physics. 1999 Jul 15;60(4):2281-2285.
Okamoto, J. ; Mizokawa, Takashi ; Fujimori, A. ; Hase, I. ; Nohara, M. ; Takagi, H. ; Takeda, Y. ; Takano, M. / Correlation effects in the electronic structure of SrRuO3. In: Physical Review B - Condensed Matter and Materials Physics. 1999 ; Vol. 60, No. 4. pp. 2281-2285.
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