Photoemission and x-ray-absorption study of misfit-layered (Bi,Pb)-Sr-Co-O compounds: Electronic structure of a hole-doped Co-O triangular lattice

Takashi Mizokawa, L. H. Tjeng, P. G. Steeneken, N. B. Brookes, I. Tsukada, T. Yamamoto, K. Uchinokura

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Abstract

We present a photoemission and x-ray-absorption study of the misfit-layered (Bi,Pb)-Sr-Co-O compounds which have a Co-O triangular lattice with a mixed valence of Co3+ and Co4+. The valence-band photoemission as well as the O 1s and Co 2p x-ray absorption spectra indicate that Co3+ and Co4+ have the low-spin t2g6 and t2g5 configurations, respectively. The angle-resolved photoemission spectra show that the dispersion of the t2g feature is very small compared to its width at each angle, suggesting that the electron-lattice coupling energy is much larger than the kinetic energy of the t2g electrons and that the carriers in the Co-O triangular lattice are essentially polarons formed by Co4+ in the nonmagnetic Co3+ background.

Original languageEnglish
Article number115104
Pages (from-to)1151041-1151047
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number11
Publication statusPublished - 2001 Sep 15
Externally publishedYes

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Photoemission
x ray absorption
Electronic structure
photoelectric emission
electronic structure
X rays
valence
Polarons
Electrons
x ray spectra
polarons
Valence bands
Crystal lattices
Kinetic energy
Absorption spectra
electrons
kinetic energy
absorption spectra
configurations
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Photoemission and x-ray-absorption study of misfit-layered (Bi,Pb)-Sr-Co-O compounds : Electronic structure of a hole-doped Co-O triangular lattice. / Mizokawa, Takashi; Tjeng, L. H.; Steeneken, P. G.; Brookes, N. B.; Tsukada, I.; Yamamoto, T.; Uchinokura, K.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 11, 115104, 15.09.2001, p. 1151041-1151047.

Research output: Contribution to journalArticle

Mizokawa, Takashi ; Tjeng, L. H. ; Steeneken, P. G. ; Brookes, N. B. ; Tsukada, I. ; Yamamoto, T. ; Uchinokura, K. / Photoemission and x-ray-absorption study of misfit-layered (Bi,Pb)-Sr-Co-O compounds : Electronic structure of a hole-doped Co-O triangular lattice. In: Physical Review B - Condensed Matter and Materials Physics. 2001 ; Vol. 64, No. 11. pp. 1151041-1151047.
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abstract = "We present a photoemission and x-ray-absorption study of the misfit-layered (Bi,Pb)-Sr-Co-O compounds which have a Co-O triangular lattice with a mixed valence of Co3+ and Co4+. The valence-band photoemission as well as the O 1s and Co 2p x-ray absorption spectra indicate that Co3+ and Co4+ have the low-spin t2g6 and t2g5 configurations, respectively. The angle-resolved photoemission spectra show that the dispersion of the t2g feature is very small compared to its width at each angle, suggesting that the electron-lattice coupling energy is much larger than the kinetic energy of the t2g electrons and that the carriers in the Co-O triangular lattice are essentially polarons formed by Co4+ in the nonmagnetic Co3+ background.",
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AU - Mizokawa, Takashi

AU - Tjeng, L. H.

AU - Steeneken, P. G.

AU - Brookes, N. B.

AU - Tsukada, I.

AU - Yamamoto, T.

AU - Uchinokura, K.

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AB - We present a photoemission and x-ray-absorption study of the misfit-layered (Bi,Pb)-Sr-Co-O compounds which have a Co-O triangular lattice with a mixed valence of Co3+ and Co4+. The valence-band photoemission as well as the O 1s and Co 2p x-ray absorption spectra indicate that Co3+ and Co4+ have the low-spin t2g6 and t2g5 configurations, respectively. The angle-resolved photoemission spectra show that the dispersion of the t2g feature is very small compared to its width at each angle, suggesting that the electron-lattice coupling energy is much larger than the kinetic energy of the t2g electrons and that the carriers in the Co-O triangular lattice are essentially polarons formed by Co4+ in the nonmagnetic Co3+ background.

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