TY - JOUR
T1 - Hard-X-ray photoelectron spectroscopy of NaxCoO 2.yH2O
AU - Chainani, A.
AU - Yokoya, T.
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.
PY - 2005/7/21
Y1 - 2005/7/21
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.
UR - https://www.scopus.com/pages/publications/22144462136
UR - https://www.scopus.com/pages/publications/22144462136#tab=citedBy
U2 - 10.1016/j.nima.2005.05.021
DO - 10.1016/j.nima.2005.05.021
M3 - Conference article
AN - SCOPUS:22144462136
SN - 0168-9002
VL - 547
SP - 163
EP - 168
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1
T2 - Proceedings of the Workshop on Hard X-Ray Photoelectron Spectroscopy HAXPES
Y2 - 11 September 2004 through 12 September 2004
ER -