Unified origin for superconductivity, magnetism, and large thermopower in Nax CoO2

K. Kuroki; R. Arita; S. Okubo; T. Nojima; H. Usui; S. Onari; Y. Tanaka

doi:10.1016/j.jpcs.2008.06.131

Unified origin for superconductivity, magnetism, and large thermopower in Na_x CoO₂

K. Kuroki, R. Arita, S. Okubo, T. Nojima, H. Usui, S. Onari, Y. Tanaka

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We argue that the large thermopower, magnetism, and superconductivity observed in Na_x CoO₂ share the same origin, namely, the peculiar shape of the a_{1 g} band. Superconductivity and magnetism arise from the local minimum structure of the band at the Γ point, while the thermopower originates from the overall "pudding mold" shape of the band. Our study shows the importance of the band structure and the Fermi surface even in strongly correlated systems.

Original language	English
Pages (from-to)	3360-3364
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	69
Issue number	12
DOIs	https://doi.org/10.1016/j.jpcs.2008.06.131
Publication status	Published - Dec 2008

Keywords

74.20.Mn
75.30.Fv
D. Fermi surface
D. Superconductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2008.06.131

Cite this

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title = "Unified origin for superconductivity, magnetism, and large thermopower in Nax CoO2",

abstract = "We argue that the large thermopower, magnetism, and superconductivity observed in Nax CoO2 share the same origin, namely, the peculiar shape of the a1 g band. Superconductivity and magnetism arise from the local minimum structure of the band at the Γ point, while the thermopower originates from the overall {"}pudding mold{"} shape of the band. Our study shows the importance of the band structure and the Fermi surface even in strongly correlated systems.",

keywords = "74.20.Mn, 75.30.Fv, D. Fermi surface, D. Superconductivity",

author = "K. Kuroki and R. Arita and S. Okubo and T. Nojima and H. Usui and S. Onari and Y. Tanaka",

note = "Funding Information: Numerical calculations were performed at the facilities of the Supercomputer Center, ISSP, University of Tokyo. This study has been supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and from the Japan Society for the Promotion of Science.",

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doi = "10.1016/j.jpcs.2008.06.131",

language = "English",

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T1 - Unified origin for superconductivity, magnetism, and large thermopower in Nax CoO2

AU - Kuroki, K.

AU - Arita, R.

AU - Okubo, S.

AU - Nojima, T.

AU - Usui, H.

AU - Onari, S.

AU - Tanaka, Y.

N1 - Funding Information: Numerical calculations were performed at the facilities of the Supercomputer Center, ISSP, University of Tokyo. This study has been supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and from the Japan Society for the Promotion of Science.

PY - 2008/12

Y1 - 2008/12

N2 - We argue that the large thermopower, magnetism, and superconductivity observed in Nax CoO2 share the same origin, namely, the peculiar shape of the a1 g band. Superconductivity and magnetism arise from the local minimum structure of the band at the Γ point, while the thermopower originates from the overall "pudding mold" shape of the band. Our study shows the importance of the band structure and the Fermi surface even in strongly correlated systems.

AB - We argue that the large thermopower, magnetism, and superconductivity observed in Nax CoO2 share the same origin, namely, the peculiar shape of the a1 g band. Superconductivity and magnetism arise from the local minimum structure of the band at the Γ point, while the thermopower originates from the overall "pudding mold" shape of the band. Our study shows the importance of the band structure and the Fermi surface even in strongly correlated systems.

KW - 74.20.Mn

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KW - D. Fermi surface

KW - D. Superconductivity

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