Bulk Electronic structure of Na$_{0.35}$CoO$_{2}$.1.3H$_{2}$O

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. Sakurai; E. Takayama-Muromachi

doi:10.1103/PhysRevB.69.180508

paper

Bulk Electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O

arXiv:cond-mat/0312293 · doi:10.1103/PhysRevB.69.180508

Abstract

High-energy (h $I^½$ = 5.95 keV) synchrotron Photoemission spectroscopy (PES) is used to study bulk electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O, the layered superconductor. In contrast to 3-dimensional doped Co oxides, Co $2p$ core level spectra show well-separated Co $^{3 +}$ and Co $^{4 +}$ ions. Cluster calculations suggest low spin Co $^{3 +}$ and Co $^{4 +}$ character, and a moderate on-site Coulomb correlation energy U $_{dd} \sim$ 3-5.5 eV. Photon dependent valence band PES identifies Co $3d$ and O $2p$ derived states, in near agreement with band structure calculations.

4 pages 4 figures Revised text added reference

Bulk Electronic structure of Na0.35​CoO2​.1.3H2​O

Abstract

Bulk Electronic structure of Na $_{0.35}$ CoO $_{2}$ .1.3H $_{2}$ O