Deformation of electronic structures due to CoO6 distortion and phase diagrams of NaxCoO2·yH2O

Masahito Mochizuki, Masao Ogata

Research output: Contribution to journalArticle

23 Citations (Scopus)

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.

Original languageEnglish
Article number113703
Journaljournal of the physical society of japan
Volume75
Issue number11
DOIs
Publication statusPublished - 2006 Nov 1

Keywords

  • Co-oxide superconductor
  • Fermi-surface topology
  • Multiorbital tight-binding model
  • Phase diagram

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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