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

A. Chainani, T. 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. SakuraiE. Takayama-Muromachi

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


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
Issue number1
Publication statusPublished - Jul 21 2005
Externally publishedYes
EventProceedings of the Workshop on Hard X-Ray Photoelectron Spectroscopy HAXPES -
Duration: Sept 11 2004Sept 12 2004


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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