Abstract
We study how the CoO6 distortion along the c-axis affects the magnetic properties and superconductivity in the novel Co-oxide superconductor Nax CoO2 · y H2 O by analyzing the multiorbital Hubbard model using the fluctuation-exchange approximation. It is shown that through generating the trigonal crystal field, the distortion pushes the Co eg′ bands up and consequently gives rise to the hole-pocket Fermi surfaces, which have been predicted in the band calculations. As the distortion increases, the hole pockets are enlarged and the ferromagnetic fluctuation as well as the pairing instability increases, which is in good agreement with recent NQR results.
| Original language | English |
|---|---|
| Pages (from-to) | 875-877 |
| Number of pages | 3 |
| Journal | Physica B: Condensed Matter |
| Volume | 378-380 |
| Issue number | SPEC. ISS. |
| DOIs | |
| Publication status | Published - 2006 May 1 |
| Externally published | Yes |
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Keywords
- CoO distortion
- Hole-pocket Fermi surface
- Multiorbital Hubbard model
- Na CoO · y H O
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
Cite this
Magnetic fluctuation and pairing instability controlled by the CoO6 distortion in the sodium cobalt oxide. / Mochizuki, Masahito; Yanase, Youichi; Ogata, Masao.
In: Physica B: Condensed Matter, Vol. 378-380, No. SPEC. ISS., 01.05.2006, p. 875-877.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Magnetic fluctuation and pairing instability controlled by the CoO6 distortion in the sodium cobalt oxide
AU - Mochizuki, Masahito
AU - Yanase, Youichi
AU - Ogata, Masao
PY - 2006/5/1
Y1 - 2006/5/1
N2 - We study how the CoO6 distortion along the c-axis affects the magnetic properties and superconductivity in the novel Co-oxide superconductor Nax CoO2 · y H2 O by analyzing the multiorbital Hubbard model using the fluctuation-exchange approximation. It is shown that through generating the trigonal crystal field, the distortion pushes the Co eg′ bands up and consequently gives rise to the hole-pocket Fermi surfaces, which have been predicted in the band calculations. As the distortion increases, the hole pockets are enlarged and the ferromagnetic fluctuation as well as the pairing instability increases, which is in good agreement with recent NQR results.
AB - We study how the CoO6 distortion along the c-axis affects the magnetic properties and superconductivity in the novel Co-oxide superconductor Nax CoO2 · y H2 O by analyzing the multiorbital Hubbard model using the fluctuation-exchange approximation. It is shown that through generating the trigonal crystal field, the distortion pushes the Co eg′ bands up and consequently gives rise to the hole-pocket Fermi surfaces, which have been predicted in the band calculations. As the distortion increases, the hole pockets are enlarged and the ferromagnetic fluctuation as well as the pairing instability increases, which is in good agreement with recent NQR results.
KW - CoO distortion
KW - Hole-pocket Fermi surface
KW - Multiorbital Hubbard model
KW - Na CoO · y H O
UR - http://www.scopus.com/inward/record.url?scp=33646416175&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646416175&partnerID=8YFLogxK
U2 - 10.1016/j.physb.2006.01.486
DO - 10.1016/j.physb.2006.01.486
M3 - Article
AN - SCOPUS:33646416175
VL - 378-380
SP - 875
EP - 877
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - SPEC. ISS.
ER -