Possible spin-triplet f-wave pairing due to disconnected fermi surfaces in NaxCoO2·yH2O

Physical Review Letters

Volumn 93, Issue 7, 2004, Pages

  Kuroki, Kazuhiko ^a   Tanaka, Yukio ^b   Arita, Ryotaro ^c  

^a UNIVERSITY OF ELECTRO COMMUNICATIONS   (Japan)

^b NAGOYA UNIVERSITY   (Japan)

^c UNIVERSITY OF TOKYO   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

APPROXIMATION THEORY; BAND STRUCTURE; CONVERGENCE OF NUMERICAL METHODS; CRYSTAL LATTICES; EMISSION SPECTROSCOPY; FERMI SURFACE; GREEN'S FUNCTION; HAMILTONIANS; MATHEMATICAL MODELS; PHOTOEMISSION; RANDOM PROCESSES; SODIUM COMPOUNDS; SUPERCONDUCTIVITY;

HUBBARD MODEL; LATTICE STRUCTURES; SINGLE BAND MODELS; SPIN SUSCEPTIBILITY;

MOLECULAR DYNAMICS;

EID: 19444369393     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.93.077001     Document Type: Article

References (37)

1. K. Takada et al., Nature (London) 422, 53 (2003).
2. H. Sakurai et al., Phys. Rev. B 68, 132507 (2003).
3. T. Waki et al., cond-mat/0306036.
4. T. Fujimoto et al., Phys. Rev. Lett. 92, 047004 (2004).
5. K. Ishida et al., J. Phys. Soc. Jpn. 72, 3041 (2003).
6. Y. Kobayashi et al., J. Phys. Soc. Jpn. 72, 2161 (2004); 72, 2453 (2004).
7. Y. Kobayashi et al., J. Phys. Soc. Jpn. 72, 2161 (2004); 72, 2453 (2004).
8. W. Higemoto et al., cond-mat/0310324 [Phys. Rev. B (to be published)].
9. Y. J. Uemura et al., cond-mat/0403031.
10. W. Koshibae and S. Maekawa, Phys. Rev. Lett. 91, 257003 (2003).
11. G. Baskaran, Phys. Rev. Lett. 91, 097003 (2003).
12. B. Kumar, B. S. Shastry, Phys. Rev. B 68, 104508 (2003).
13. Q.-H. Wang, et al., Phys. Rev. B 69, 092504 (2004).
14. M. Ogata, J. Phys. Soc. Jpn. 72, 1839 (2003).
15. A. Tanaka and X. Hu, Phys. Rev. Lett. 91, 257006 (2003).
16. H. Ikeda, et al., J. Phys. Soc. Jpn. 73, 17 (2004).
17. Y. Tanaka et al., J. Phys. Soc. Jpn. 73, 319 (2004).
18. R. Arita et al., Phys. Rev. B 60, 14585 (1999); J. Phys. Soc. Jpn. 69, 1181 (2000).
19. R. Arita et al., Phys. Rev. B 60, 14585 (1999); J. Phys. Soc. Jpn. 69, 1181 (2000).
20. P. Monthoux and G. Lonzarich, Phys. Rev. B 59, 14598 (1999).
21. K. Kuroki and R. Arita, Phys. Rev. B 63, 174507 (2001).
22. K. Kuroki and R. Arita, Phys. Rev. B 64, 024501 (2001).
23. D. J.Singh, Phys. Rev. B 61, 13397 (2000); M. D. Johannes and D. J.Singh, cond-mat/0401646 [Phys. Rev. B (to be published)].
24. D. J.Singh, Phys. Rev. B 61, 13397 (2000); M. D. Johannes and D. J.Singh, cond-mat/0401646 [Phys. Rev. B (to be published)].
25. 2, where it is believed that some of the bands play an essential role in the occurrence of superconductivity, while other bands are only passive bands, where superconductivity is induced by interband interaction effects.
26. N. E. Bickers et al., Phys. Rev. Lett. 62, 961 (1989).
27. T. Dahm and L. Tewordt, Phys. Rev. B 52, 1297 (1995).
28. S. Grabowski et al. Solid State Commun. 98, 611 (1996).
29. In the lowest temperatures, we could not strictly check the convergence of the results with respect to number of sites since a large number of Matsubara frequencies is required. Nevertheless, the tendency that large λ is obtained at low temperatures should in any case be correct.
30. c for f-wave superconductivity is obtained even though the gap intersects the Fermi surface, in contrast to FLEX results. Such a discrepancy between perturbational studies and FLEX seems to be a general trend. Concerning this trend, we have recently performed quantum Monte Carlo calculation on a square lattice (K.Kuroki, et al., Phys. Rev. B 69, 214511 (2004).), where we have found results supporting FLEX studies.
31. After completion of the present study, this scenario has quite recently been supported by a multiband FLEX study by M. Mochizuki and M. Ogata, which takes into account both the pockets and the large Fermi surface (unpublished).
32. M. Z. Hasan et al., Phys. Rev. Lett. 92, 246402 (2004).
33. H.-B. Yang et al., Phys. Rev. Lett. 92, 246403 (2004).
34. 2 due to oxygen vacancy.
35. R. E. Schaak et al. Nature (London) 424, 527 (2003)
36. J. R. Schrieffer, J. Low Temp. Phys. 99, 397 (1995).
37. R.Arita et al., J. Phys. Soc. Jpn. 73, 533 (2004).