Hard-X-ray photoelectron spectroscopy of NaxCoO 2.yH2O

A. Chainani, Takayoshi Yokoya, Y. Takata, K. Tamasaku, M. Taguchi, T. Shimojima, N. Kamakura, K. Horiba, S. Tsuda, S. Shin, D. Miwa, Y. Nishino, T. Ishikawa, M. Yabashi, K. Kobayashi, H. Namatame, M. Taniguchi, K. Takada, T. Sasaki, H. Sakurai & 1 others E. Takayama-Muromachi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We study the bulk electronic structure of NaxCoO2.yH2O using Hard X-ray (HX, hν = 5.95 KeV) synchrotron photoelectron spectroscopy (PES). The Co 2p core level spectra show well-separated Co3+ and Co4+ ions. Cluster calculations suggest low spin Co3+ and Co4+ character, and a moderate on-site Coulomb correlation energy Udd∼3-5.5 eV. Photon-dependent valence band PES identifies Co 3d and O 2p derived states, in near agreement with band structure calculations. We discuss the importance of HX-PES for studying correlated transition metal oxides.

Original languageEnglish
Pages (from-to)163-168
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume547
Issue number1
DOIs
Publication statusPublished - Jul 21 2005
Externally publishedYes

Fingerprint

Photoelectron spectroscopy
X ray photoelectron spectroscopy
photoelectron spectroscopy
x rays
Core levels
Valence bands
Synchrotrons
Band structure
Electronic structure
Transition metals
metal oxides
synchrotrons
Photons
transition metals
electronic structure
valence
X rays
Oxides
Ions
photons

Keywords

  • Cobaltates
  • Correlated electrons
  • Hard X-ray photoelectron spectroscopy
  • Superconductivity

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

Hard-X-ray photoelectron spectroscopy of NaxCoO 2.yH2O. / Chainani, A.; Yokoya, Takayoshi; Takata, Y.; Tamasaku, K.; Taguchi, M.; Shimojima, T.; Kamakura, N.; Horiba, K.; Tsuda, S.; Shin, S.; Miwa, D.; Nishino, Y.; Ishikawa, T.; Yabashi, M.; Kobayashi, K.; Namatame, H.; Taniguchi, M.; Takada, K.; Sasaki, T.; Sakurai, H.; Takayama-Muromachi, E.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 547, No. 1, 21.07.2005, p. 163-168.

Research output: Contribution to journalArticle

Chainani, A, Yokoya, T, Takata, Y, Tamasaku, K, Taguchi, M, Shimojima, T, Kamakura, N, Horiba, K, Tsuda, S, Shin, S, Miwa, D, Nishino, Y, Ishikawa, T, Yabashi, M, Kobayashi, K, Namatame, H, Taniguchi, M, Takada, K, Sasaki, T, Sakurai, H & Takayama-Muromachi, E 2005, 'Hard-X-ray photoelectron spectroscopy of NaxCoO 2.yH2O', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 547, no. 1, pp. 163-168. https://doi.org/10.1016/j.nima.2005.05.021
Chainani, A. ; Yokoya, Takayoshi ; Takata, Y. ; Tamasaku, K. ; Taguchi, M. ; Shimojima, T. ; Kamakura, N. ; Horiba, K. ; Tsuda, S. ; Shin, S. ; Miwa, D. ; Nishino, Y. ; Ishikawa, T. ; Yabashi, M. ; Kobayashi, K. ; Namatame, H. ; Taniguchi, M. ; Takada, K. ; Sasaki, T. ; Sakurai, H. ; Takayama-Muromachi, E. / Hard-X-ray photoelectron spectroscopy of NaxCoO 2.yH2O. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2005 ; Vol. 547, No. 1. pp. 163-168.
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AU - Yokoya, Takayoshi

AU - Takata, Y.

AU - Tamasaku, K.

AU - Taguchi, M.

AU - Shimojima, T.

AU - Kamakura, N.

AU - Horiba, K.

AU - Tsuda, S.

AU - Shin, S.

AU - Miwa, D.

AU - Nishino, Y.

AU - Ishikawa, T.

AU - Yabashi, M.

AU - Kobayashi, K.

AU - Namatame, H.

AU - Taniguchi, M.

AU - Takada, K.

AU - Sasaki, T.

AU - Sakurai, H.

AU - Takayama-Muromachi, E.

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N2 - We study the bulk electronic structure of NaxCoO2.yH2O using Hard X-ray (HX, hν = 5.95 KeV) synchrotron photoelectron spectroscopy (PES). The Co 2p core level spectra show well-separated Co3+ and Co4+ ions. Cluster calculations suggest low spin Co3+ and Co4+ character, and a moderate on-site Coulomb correlation energy Udd∼3-5.5 eV. Photon-dependent valence band PES identifies Co 3d and O 2p derived states, in near agreement with band structure calculations. We discuss the importance of HX-PES for studying correlated transition metal oxides.

AB - We study the bulk electronic structure of NaxCoO2.yH2O using Hard X-ray (HX, hν = 5.95 KeV) synchrotron photoelectron spectroscopy (PES). The Co 2p core level spectra show well-separated Co3+ and Co4+ ions. Cluster calculations suggest low spin Co3+ and Co4+ character, and a moderate on-site Coulomb correlation energy Udd∼3-5.5 eV. Photon-dependent valence band PES identifies Co 3d and O 2p derived states, in near agreement with band structure calculations. We discuss the importance of HX-PES for studying correlated transition metal oxides.

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KW - Correlated electrons

KW - Hard X-ray photoelectron spectroscopy

KW - Superconductivity

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