Superconductivity in NaxCoO2•yH2O due to charge fluctuation

被引：76

作者：

Tanaka, Y ^{[1
]}

Yanase, Y ^{[1
]}

Ogata, M ^{[1
]}

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2004年 / 73卷 / 02期

关键词：

Co-based oxides; charge fluctuation; triplet superconductivity;

D O I：

10.1143/JPSJ.73.319

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new mechanism of superconductivity due to charge fluctuation in the newly discovered Co-based oxide is proposed. A single-band extended Hubbard model on a triangular lattice is studied within the random phase approximation. f-wave triplet superconductivity is stabilized in the vicinity of charge-density-wave instability, which is in sharp contrast to the square-lattice case. The physical origin of the realization of the f-wave triplet state as well as its relevance to experiments are discussed.

引用

收藏

页码：319 / 322

页数：4

相关论文

共 28 条

[1] THE RESONATING VALENCE BOND STATE IN LA2CUO4 AND SUPERCONDUCTIVITY [J].

ANDERSON, PW .

SCIENCE, 1987, 235 (4793) :1196-1198

[2] RESONATING VALENCE BONDS - NEW KIND OF INSULATOR [J].

ANDERSON, PW .

MATERIALS RESEARCH BULLETIN, 1973, 8 (02) :153-160

[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]

HIGEMOTO W, CONDMAT0310324

[5] Possibility of f-wave spin-triplet superconductivity in the CoO2 superconductor:: A case study on a 2D triangular lattice in the repulsive Hubbard model [J].

Ikeda, H ;

Nisikawa, Y ;

Yamada, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2004, 73 (01) :17-20

[6] Unconventional superconductivity and nearly ferromagnetic spin fluctuations in NaxCoO2•γH2O [J].

Ishida, K ;

Ihara, Y ;

Maeno, Y ;

Michioka, C ;

Kato, M ;

Yoshimura, K ;

Takada, K ;

Sasaki, T ;

Sakurai, H ;

Takayama-Muromachi, E .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2003, 72 (12) :3041-3044

[7]

KOBAYASHI A, CONDMAT0310576

[8] 59Co-NMR knight shift of superconducting NaxCoO2•yH2O [J].

Kobayashi, Y ;

Yokoi, M ;

Sato, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2003, 72 (10) :2453-2455

[9] 59Co NQR study on superconducting NaxCoO2•yH2O [J].

Kobayashi, Y ;

Yokoi, M ;

Sato, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2003, 72 (09) :2161-2164

[10] Ferromagnetism on the frustrated lattices [J].

Koretsune, T ;

Ogata, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2003, 72 (10) :2437-2440