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.

引用

收藏

页数：4

相关论文

共 36 条

[1] 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)

[2] Proximity of the layered organic conductors α-(BEDT-TTF)2MHg(SCN)4 (M=K,NH4) to a charge-ordering transition -: art. no. 167002 [J].

Dressel, M ;

Drichko, N ;

Schlueter, J ;

Merino, J .

PHYSICAL REVIEW LETTERS, 2003, 90 (16) :4

[3] Large-N expansion based on the Hubbard operator path integral representation and its application to the t-J model.: II.: The case for finite J -: art. no. 205123 [J].

Foussats, A ;

Greco, A .

PHYSICAL REVIEW B, 2004, 70 (20) :205123-1

[4] Large-N expansion based on the Hubbard operator path integral representation and its application to the t-J model -: art. no. 195107 [J].

Foussats, A ;

Greco, A .

PHYSICAL REVIEW B, 2002, 65 (19) :1951071-1951076

[5]

FOUSSATS A, UNPUB

[6]

FRANCK JP, 1994, PHYSICAL PROPERTIES, V4, P189

[7] Unconventional superconductivity and electron correlations in the cobalt oxyhydrate Na0.35CoO2•yH2O from nuclear quadrupole resonance -: art. no. 047004 [J].

Fujimoto, T ;

Zheng, GQ ;

Kitaoka, Y ;

Meng, RL ;

Cmaidalka, J ;

Chu, CW .

PHYSICAL REVIEW LETTERS, 2004, 92 (04) :4

[8] Electronic correlations, electron-phonon interaction, and isotope effect in high-Tc cuprates [J].

Greco, A ;

Zeyher, R .

PHYSICAL REVIEW B, 1999, 60 (02) :1296-1302

[9] Fermi surface and quasiparticle dynamics of Na0.7CoO2 investigated by angle-resolved photoemission spectroscopy -: art. no. 246402 [J].

Hasan, MZ ;

Chuang, YD ;

Qian, D ;

Li, YW ;

Kong, Y ;

Kuprin, A ;

Fedorov, AV ;

Kimmerling, R ;

Rotenberg, E ;

Rossnagel, K ;

Hussain, Z ;

Koh, H ;

Rogado, NS ;

Foo, ML ;

Cava, RJ .

PHYSICAL REVIEW LETTERS, 2004, 92 (24) :246402-1

[10] Possible unconventional superconductivity in NaxCoO2•yH2O probed by muon spin rotation and relaxation -: art. no. 134508 [J].

Higemoto, W ;

Ohishi, K ;

Koda, A ;

Saha, SR ;

Kadono, R ;

Ishida, K ;

Takada, K ;

Sakurai, H ;

Takayama-Muromachi, E ;

Sasaki, T .

PHYSICAL REVIEW B, 2004, 70 (13) :134508-1

← 1 2 3 4 →