Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates

被引：13
作者：
Foussats, A
Greco, A
Bejas, M
Muramatsu, A
机构：
[1] Fac Ciencias Exactas, RA-2000 Rosario, Argentina
[2] Consejo Nacl Invest Cient & Tecn, Inst Fis Rosario, UNR, RA-2000 Rosario, Argentina
[3] Univ Stuttgart, Inst Theoret Phys 3, D-70550 Stuttgart, Germany
来源：
PHYSICAL REVIEW B | 2005年 / 72卷 / 02期
关键词：
D O I：
10.1103/PhysRevB.72.020504
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We propose that unconventional superconductivity in hydrated sodium cobaltate NaxCoO2 results from an interplay of electronic correlations and electron-phonon interactions. On the basis of the t-V model plus phonons we found evidence for (a) unconventional superconductivity, (b) realistic values of T-c, and (c) the dome shape existing near x similar to 0.35. This picture is obtained for V close to the critical Coulomb repulsion V-c, which separates the uniform Fermi liquid from root 3x root 3 charge-density-wave-ordered phase.
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页数：4
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共 36 条
[21]   Dynamical properties of a strongly correlated model for quarter-filled layered organic molecular crystals [J].
Merino, J ;
Greco, A ;
McKenzie, RH ;
Calandra, M .
PHYSICAL REVIEW B, 2003, 68 (24)
[22]  
MOTUNICH OI, 2004, PHYS REV B, V70
[23]   Electronic frustration on a triangular lattice [J].
Ong, NP ;
Cava, RJ .
SCIENCE, 2004, 305 (5680) :52-53
[24]  
SAKURAI H, IN PRESS J PHYS SOC
[25]   Superconductivity phase diagram of NaxCoO2•1.3H2O [J].
Schaak, RE ;
Klimczuk, T ;
Foo, ML ;
Cava, RJ .
NATURE, 2003, 424 (6948) :527-529
[26]   Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ -: art. no. 125111 [J].
Sing, M ;
Schwingenschlögl, U ;
Claessen, R ;
Blaha, P ;
Carmelo, JMP ;
Martelo, LM ;
Sacramento, PD ;
Dressel, M ;
Jacobsen, CS .
PHYSICAL REVIEW B, 2003, 68 (12)
[27]   Superconductivity in two-dimensional CoO2 layers [J].
Takada, K ;
Sakurai, H ;
Takayama-Muromachi, E ;
Izumi, F ;
Dilanian, RA ;
Sasaki, T .
NATURE, 2003, 422 (6927) :53-55
[28]   Superconductivity in NaxCoO2•yH2O due to charge fluctuation [J].
Tanaka, Y ;
Yanase, Y ;
Ogata, M .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2004, 73 (02) :319-322
[29]   Infrared probe of the electronic structure and charge dynamics of Na0.7CoO2 -: art. no. 237007 [J].
Wang, NL ;
Zheng, P ;
Wu, D ;
Ma, YC ;
Xiang, T ;
Jin, RY ;
Mandrus, D .
PHYSICAL REVIEW LETTERS, 2004, 93 (23)
[30]   Doped t-J model on a triangular lattice:: Possible application to NaxCoO2•yH2O and Na1-xTiO2 -: art. no. 092504 [J].
Wang, QH ;
Lee, DH ;
Lee, PA .
PHYSICAL REVIEW B, 2004, 69 (09)
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