Electronic structure of sodium cobalt oxide: Comparing mono- and bilayer hydrate

被引：14

作者：

Arita, R

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[2] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.71.132503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To shed light on the mechanism of superconductivity in sodium cobalt oxide bilayer-hydrate (BLH), we perform a density functional calculation with full structure optimization for BLH and its related nonsuperconducting phase, monolayer hydrate (MLH). We find that these hydrates have similar band structures, but a notable difference can be seen in the a(1g) band around the Fermi level. While its dispersion in the z direction is negligibly small for BLH, it is of the order of 0.1 eV for MLH. This result implies that the three-dimensional feature of the a(1g) band may be the origin for the absence of superconductivity in MLH.

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页数：4

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共 33 条

[1] d- and p-wave superconductivity mediated by spin fluctuations in two- and three-dimensional single-band repulsive Hubbard model [J].

Arita, R ;

Kuroki, K ;

Aoki, H .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2000, 69 (04) :1181-1191

[2] Spin-fluctuation exchange study of superconductivity in two- and three-dimensional single-band Hubbard models [J].

Arita, R ;

Kuroki, K ;

Aoki, H .

PHYSICAL REVIEW B, 1999, 60 (21) :14585-14588

[3] Electronic model for CoO2 layer based systems:: Chiral resonating valence bond metal and superconductivity -: art. no. 097003 [J].

Baskaran, G .

PHYSICAL REVIEW LETTERS, 2003, 91 (09)

[4] Instabilities of interacting electrons on the triangular lattice [J].

Honerkamp, C .

PHYSICAL REVIEW B, 2003, 68 (10)

[5] Nesting, spin fluctuations, and odd-gap superconductivity in NaxCoO2•yH2O -: art. no. 097005 [J].

Johannes, MD ;

Mazin, II ;

Singh, DJ ;

Papaconstantopoulos, DA .

PHYSICAL REVIEW LETTERS, 2004, 93 (09) :097005-1

[6] Comparison of the electronic structures of hydrated and unhydrated NaxCoO2:: The effect of H2O -: art. no. 014507 [J].

Johannes, MD ;

Singh, DJ .

PHYSICAL REVIEW B, 2004, 70 (01) :014507-1

[7] Crystal structure of the sodium cobaltate deuterate superconductor NaxCoO2•4xD2O (x≈1/3) -: art. no. 214517 [J].

Jorgensen, JD ;

Avdeev, M ;

Hinks, DG ;

Burley, JC ;

Short, S .

PHYSICAL REVIEW B, 2003, 68 (21)

[8] Electronic state of a CoO2 layer with hexagonal structure:: A Kagome lattice structure in a triangular lattice -: art. no. 257003 [J].

Koshibae, W ;

Maekawa, S .

PHYSICAL REVIEW LETTERS, 2003, 91 (25)

[9] Superconductivity in CoO2 layers and the resonating valence bond mean-field theory of the triangular lattice t-J model -: art. no. 104508 [J].

Kumar, B ;

Shastry, BS .

PHYSICAL REVIEW B, 2003, 68 (10)

[10] Competition between singlet and triplet pairings in NaxCoO2•y H2O -: art. no. 024506 [J].

Kuroki, K ;

Tanaka, Y ;

Arita, R .

PHYSICAL REVIEW B, 2005, 71 (02)

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