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 language | English |
|---|---|
| Article number | 113703 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 75 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2006 Nov |
| Externally published | Yes |
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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 journal › Article
}
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 -