Deformation of Electronic Structures Due to CoO6 Distortion and Phase Diagrams of NaxCoO2·yH2O

• Mochizuki Masahito

  RIKEN

• Ogata Masao

  Department of Physics, University of Tokyo

Bibliographic Information

Other Title

• Deformation of Electronic Structures Due to CoO6 Distortion and Phase Diagrams of NaxCoO2・yH2O
• Deformation of Electronic Structures Due to CoO₆ Distortion and Phase Diagrams of Na_<i>x</i>CoO₂·<i>y</i>H₂O

Abstract

Motivated by recently reported experimental phase diagrams, we study the effects of CoO₆ distortion on the electronic structure in Na_xCoO₂·yH₂O. We construct the multiband tight-binding model by employing the LDA result. Analyzing this model, we show the deformation of band dispersions and Fermi-surface topology as functions of CoO₂-layer thickness. Considering these results together with previous theoretical ones, we propose a possible schematic phase diagram with three successive phases: the extended s-wave superconductivity (SC), the magnetic order, and the spin-triplet SC phases when the Co valence number s is +3.4. A phase diagram with only one phase of spin-triplet SC is also proposed for the s=+3.5 case.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 75 (11), 113703-, 2006

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• Co-oxide superconductor
• multiorbital tight-binding model
• phase diagram
• Fermi-surface topology

Details

• CRID: 1390282679165619840
• NII Article ID: 110004852747
• NII Article ID: 210000106392
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.75.113703
• BIBCODE: 2006JPSJ...75k3703M
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 8537331
• Web Site: http://id.ndl.go.jp/bib/8537331
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8537331
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.113703
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed