Unified origin for the 3D magnetism and superconductivity in NaxCoO2

Kazuhiko Kuroki; Shuhei Ohkubo; Takumi Nojima; Ryotaro Arita; Seiichiro Onari; Yukio Tanaka

doi:10.1103/PhysRevLett.98.136401

Unified origin for the 3D magnetism and superconductivity in NaxCoO2

Kazuhiko Kuroki, Shuhei Ohkubo, Takumi Nojima, Ryotaro Arita, Seiichiro Onari, Yukio Tanaka

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

21 Citations (Scopus)

Abstract

We analyze the origin of the three-dimensional (3D) magnetism observed in nonhydrated Na-rich NaxCoO2 within an itinerant spin picture using a 3D Hubbard model. The origin is identified as the 3D nesting between the inner and outer portions of the Fermi surface, which arise due to the local minimum structure of the a1g band at the Γ-A line. The calculated spin wave dispersion strikingly resembles the neutron scattering result. We argue that this 3D magnetism and the spin fluctuations responsible for superconductivity in the hydrated systems share essentially the same origin.

Original language	English
Article number	136401
Journal	Physical Review Letters
Volume	98
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.98.136401
Publication status	Published - Mar 27 2007

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.98.136401

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abstract = "We analyze the origin of the three-dimensional (3D) magnetism observed in nonhydrated Na-rich NaxCoO2 within an itinerant spin picture using a 3D Hubbard model. The origin is identified as the 3D nesting between the inner and outer portions of the Fermi surface, which arise due to the local minimum structure of the a1g band at the Γ-A line. The calculated spin wave dispersion strikingly resembles the neutron scattering result. We argue that this 3D magnetism and the spin fluctuations responsible for superconductivity in the hydrated systems share essentially the same origin.",

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AU - Onari, Seiichiro

AU - Tanaka, Yukio

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AB - We analyze the origin of the three-dimensional (3D) magnetism observed in nonhydrated Na-rich NaxCoO2 within an itinerant spin picture using a 3D Hubbard model. The origin is identified as the 3D nesting between the inner and outer portions of the Fermi surface, which arise due to the local minimum structure of the a1g band at the Γ-A line. The calculated spin wave dispersion strikingly resembles the neutron scattering result. We argue that this 3D magnetism and the spin fluctuations responsible for superconductivity in the hydrated systems share essentially the same origin.

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Unified origin for the 3D magnetism and superconductivity in NaxCoO2

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