Photoemission study of the skutterudite compounds Co(Sb$_{1-x}$Te$_{x}$)$_3$ and RhSb$_3$

H. Ishii; K. Okazaki; A. Fujimori; Y. Nagamoto; T. Koyanagi; J. O. Sofo

doi:10.1143/JPSJ.71.2271

paper

Photoemission study of the skutterudite compounds Co(Sb $_{1 - x}$ Te $_{x}$ ) $_{3}$ and RhSb $_{3}$

arXiv:cond-mat/0103342 · doi:10.1143/JPSJ.71.2271

Abstract

We have studied the electronic structure of the skutterudite compounds Co(Sb $_{1 - x}$ Te $_{x}$ ) $_{3}$ (x= 0, 0.02, 0.04) by photoemission spectroscopy. Valence-band spectra revealed that Sb 5p states are dominant near the Fermi level and are hybridized with Co 3d states just below it. The spectra of {\it p}-type CoSb $_{3}$ are well reproduced by the band-structure calculation, which suggests that the effect of electron correlations is not strong in CoSb $_{3}$ . When Te is substituted for Sb and n-type carriers are doped into CoSb $_{3}$ , the spectra are shifted to higher binding energies as predicted by the rigid-band model. From this shift and the free-electron model for the conduction and valence bands, we have estimated the band gap of CoSb $_{3}$ to be 0.03-0.04 eV, which is consistent with the result of transport measurements. Photoemission spectra of RhSb $_{3}$ have also been measured and revealed similarities to and differences from those of CoSb $_{3}$ .

6 pages, 7 figures

Photoemission study of the skutterudite compounds Co(Sb1−x​Tex​)3​ and RhSb3​

Abstract

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Photoemission study of the skutterudite compounds Co(Sb $_{1 - x}$ Te $_{x}$ ) $_{3}$ and RhSb $_{3}$