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
Externally publishedYes

Fingerprint

superconductivity
diagrams
phase diagrams
electronic structure
circuit diagrams
Fermi surfaces
topology
valence

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Deformation of electronic structures due to CoO6 distortion and phase diagrams of NaxCoO2·yH2O. / Mochizuki, Masahito; Ogata, Masao.

In: Journal of the Physical Society of Japan, Vol. 75, No. 11, 113703, 11.2006.

Research output: Contribution to journalArticle

@article{e41964ca0ed94fe1a3975d02f9bba892,
title = "Deformation of electronic structures due to CoO6 distortion and phase diagrams of NaxCoO2·yH2O",
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.",
keywords = "Co-oxide superconductor, Fermi-surface topology, Multiorbital tight-binding model, Phase diagram",
author = "Masahito Mochizuki and Masao Ogata",
year = "2006",
month = "11",
doi = "10.1143/JPSJ.75.113703",
language = "English",
volume = "75",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "11",

}

TY - JOUR

T1 - Deformation of electronic structures due to CoO6 distortion and phase diagrams of NaxCoO2·yH2O

AU - Mochizuki, Masahito

AU - Ogata, Masao

PY - 2006/11

Y1 - 2006/11

N2 - 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.

AB - 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.

KW - Co-oxide superconductor

KW - Fermi-surface topology

KW - Multiorbital tight-binding model

KW - Phase diagram

UR - http://www.scopus.com/inward/record.url?scp=33847357335&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847357335&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.75.113703

DO - 10.1143/JPSJ.75.113703

M3 - Article

AN - SCOPUS:33847357335

VL - 75

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 11

M1 - 113703

ER -