TY - JOUR
T1 - Photoemission study of Rh17S15 superconductor
AU - Fukui, Masaki
AU - Yoshida, Rikiya
AU - Nakamura, Yoshiaki
AU - Kato, Yukako
AU - Muro, Takayuki
AU - Settai, Rikio
AU - Onuki, Yoshichika
AU - Harima, Hisatomo
AU - Hirai, Masaaki
AU - Muraoka, Yuji
AU - Yokoya, Takayoshi
PY - 2011/7
Y1 - 2011/7
N2 - We have investigated the electronic structures of Rh17S 15 by using soft x-ray photoemission spectroscopy and first principle band structure calculations. While S 2p core level spectra are explained by symmetric components, Rh 3d core level exhibits asymmetric line shape, suggesting a dominant Rh 4d character at the states near the Fermi level. The binding energy of Rh 4d in Rh17S15 is similar to the one in Rh metal, and this observation implies metallic Rh-Rh bonding. Many features in experimental valence spectra are reasonably described by the calculations, indicating that one particle approximation is a good starting point to understand the electronic properties of Rh17S15. The comparison between the experiment and the calculation suggests that Rh 4d character at the states near the Fermi level is essential for the correlated superconductivity in Rh17S15. However, some deviation between the experiment and the calculation as well as a finite mass enhancement are found, indicating some corrections on the treatment of electron-phonon coupling and/or electron correlations are necessary.
AB - We have investigated the electronic structures of Rh17S 15 by using soft x-ray photoemission spectroscopy and first principle band structure calculations. While S 2p core level spectra are explained by symmetric components, Rh 3d core level exhibits asymmetric line shape, suggesting a dominant Rh 4d character at the states near the Fermi level. The binding energy of Rh 4d in Rh17S15 is similar to the one in Rh metal, and this observation implies metallic Rh-Rh bonding. Many features in experimental valence spectra are reasonably described by the calculations, indicating that one particle approximation is a good starting point to understand the electronic properties of Rh17S15. The comparison between the experiment and the calculation suggests that Rh 4d character at the states near the Fermi level is essential for the correlated superconductivity in Rh17S15. However, some deviation between the experiment and the calculation as well as a finite mass enhancement are found, indicating some corrections on the treatment of electron-phonon coupling and/or electron correlations are necessary.
KW - Correlated superconductor
KW - Electronic structures
KW - Soft x-ray photoemission spectroscopy
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U2 - 10.1143/JPSJS.80SA.SA111
DO - 10.1143/JPSJS.80SA.SA111
M3 - Article
AN - SCOPUS:80052421543
VL - 80
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - SUPPL. A
M1 - SA111
ER -