Electronic structure of Ca 3CoXO 6 (X=Co, Rh, Ir) studied by x-ray photoemission spectroscopy

K. Takubo, Takashi Mizokawa, S. Hirata, J. Y. Son, A. Fujimori, D. Topwal, D. D. Sarma, S. Rayaprol, E. V. Sampathkumaran

Research output: Contribution to journalArticle

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Abstract

We have obtained Co 2p, Rh 3d, Ir 4f, and valence-band x-ray photoemission spectra of Ca 3Co 2O 6, Ca 3CoRhO 6, Ca 3CoIrO 6, and Sr 3ZnIrO 6 in order to determine the valence states of Co. The spectral features are consistent with the picture that Co is in the trivalent state at both trigonal prismatic and octahedral sites with high- and low-spin states, respectively, in Ca 3Co 2O 6, whereas Co is in the high-spin Co 2+ state for Ca 3CoRhO 6 and Ca 3CoIrO 6. This conclusion resolves a recent controversy regarding the valence and spin states of Co in Ca 3Co 2O 6 and Ca 3CoRhO 6. This is the first x-ray photoemission spectroscopic study of this family of oxides.

Original languageEnglish
Article number073406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number7
DOIs
Publication statusPublished - 2005 Feb
Externally publishedYes

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Photoemission
Photoelectron spectroscopy
Electronic structure
photoelectric emission
electronic structure
X rays
Valence bands
valence
Oxides
spectroscopy
x rays
oxides

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electronic structure of Ca 3CoXO 6 (X=Co, Rh, Ir) studied by x-ray photoemission spectroscopy. / Takubo, K.; Mizokawa, Takashi; Hirata, S.; Son, J. Y.; Fujimori, A.; Topwal, D.; Sarma, D. D.; Rayaprol, S.; Sampathkumaran, E. V.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 7, 073406, 02.2005.

Research output: Contribution to journalArticle

Takubo, K. ; Mizokawa, Takashi ; Hirata, S. ; Son, J. Y. ; Fujimori, A. ; Topwal, D. ; Sarma, D. D. ; Rayaprol, S. ; Sampathkumaran, E. V. / Electronic structure of Ca 3CoXO 6 (X=Co, Rh, Ir) studied by x-ray photoemission spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 71, No. 7.
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abstract = "We have obtained Co 2p, Rh 3d, Ir 4f, and valence-band x-ray photoemission spectra of Ca 3Co 2O 6, Ca 3CoRhO 6, Ca 3CoIrO 6, and Sr 3ZnIrO 6 in order to determine the valence states of Co. The spectral features are consistent with the picture that Co is in the trivalent state at both trigonal prismatic and octahedral sites with high- and low-spin states, respectively, in Ca 3Co 2O 6, whereas Co is in the high-spin Co 2+ state for Ca 3CoRhO 6 and Ca 3CoIrO 6. This conclusion resolves a recent controversy regarding the valence and spin states of Co in Ca 3Co 2O 6 and Ca 3CoRhO 6. This is the first x-ray photoemission spectroscopic study of this family of oxides.",
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T1 - Electronic structure of Ca 3CoXO 6 (X=Co, Rh, Ir) studied by x-ray photoemission spectroscopy

AU - Takubo, K.

AU - Mizokawa, Takashi

AU - Hirata, S.

AU - Son, J. Y.

AU - Fujimori, A.

AU - Topwal, D.

AU - Sarma, D. D.

AU - Rayaprol, S.

AU - Sampathkumaran, E. V.

PY - 2005/2

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N2 - We have obtained Co 2p, Rh 3d, Ir 4f, and valence-band x-ray photoemission spectra of Ca 3Co 2O 6, Ca 3CoRhO 6, Ca 3CoIrO 6, and Sr 3ZnIrO 6 in order to determine the valence states of Co. The spectral features are consistent with the picture that Co is in the trivalent state at both trigonal prismatic and octahedral sites with high- and low-spin states, respectively, in Ca 3Co 2O 6, whereas Co is in the high-spin Co 2+ state for Ca 3CoRhO 6 and Ca 3CoIrO 6. This conclusion resolves a recent controversy regarding the valence and spin states of Co in Ca 3Co 2O 6 and Ca 3CoRhO 6. This is the first x-ray photoemission spectroscopic study of this family of oxides.

AB - We have obtained Co 2p, Rh 3d, Ir 4f, and valence-band x-ray photoemission spectra of Ca 3Co 2O 6, Ca 3CoRhO 6, Ca 3CoIrO 6, and Sr 3ZnIrO 6 in order to determine the valence states of Co. The spectral features are consistent with the picture that Co is in the trivalent state at both trigonal prismatic and octahedral sites with high- and low-spin states, respectively, in Ca 3Co 2O 6, whereas Co is in the high-spin Co 2+ state for Ca 3CoRhO 6 and Ca 3CoIrO 6. This conclusion resolves a recent controversy regarding the valence and spin states of Co in Ca 3Co 2O 6 and Ca 3CoRhO 6. This is the first x-ray photoemission spectroscopic study of this family of oxides.

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