Hybridization-induced superconductivity from electron repulsion on a tetramer lattice having a disconnected Fermi surface

Physical Review B - Condensed Matter and Materials Physics

Volumn 66, Issue 21, 2002, Pages 1-4

  Kimura, Takashi ^a,b   Zenitani, Yuji ^c   Kuroki, Kazuhiko ^d   Arita, Ryotaro ^a   Aoki, Hideo ^a  

^a UNIVERSITY OF TOKYO   (Japan)

^b WASEDA UNIVERSITY   (Japan)

^c AOYAMA GAKUIN UNIVERSITY   (Japan)

^d UNIVERSITY OF ELECTRO COMMUNICATIONS   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 85038319942     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.66.212505     Document Type: Article

References (20)

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13. Although this lattice might seem similar to the one considered in G. Sierra et al. [Phys. Rev. B 59, 7973 (1999)], the latter studies magnetic properties of the (formula presented) model around the quarter filling, while we question here superconducting properties of the Hubbard model around the half-filling.
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18. (formula presented) depends only on the absolute values of t or (formula presented) The invariance under (formula presented) and/or (formula presented) can be shown with a gauge transformation, (formula presented) and (formula presented) for (formula presented) and (formula presented) (formula presented) for (formula presented) where x and y are the position of the unit cell measured in units of the cell size.
19. K. Kuroki et al. (Ref. 19) have performed a similar calculation on the quasi-one-dimensional α and β bands in a ruthenate, (formula presented) (Ref. 16). In this case, the spin susceptibility χ(q,ω) exhibits linear ridges in k space due to the quasi-one-dimensionality. As a result, the pair scatterings have large contributions all over the ridges, so that the (extended) s-wave gap function involves unfavorable pair scatterings across which the gap has the same sign, resulting in a reduced (formula presented) By contrast, the present lattice has a built-in antiferromagnetic structure within the unit cell in real space, so that the spin susceptibility has a well-defined peak around (φ,φ) in place of ridges. This makes a specific Q to be relevant in the pair scattering, which makes the gap function peaked at specific points, which in turn gives rise to an enhanced (formula presented)
20. K. Kuroki, M. Ogata, R. Arita, and H. Aoki, Phys. Rev. B 63, 060506(R) (2001).