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 article

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
EventProceedings of the Workshop on Hard X-Ray Photoelectron Spectroscopy HAXPES -
Duration: Sep 11 2004Sep 12 2004

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Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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., ... 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, 547(1), 163-168. https://doi.org/10.1016/j.nima.2005.05.021