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

Abstract

Plaquette lattices with each unit cell containing multiple atoms are good candidates for disconnected Fermi surfaces, which are shown by Kuroki and Arita to be favorable for spin-flucutation mediated superconductivity from electron repulsion. Here we find an interesting example in a tetramer lattice where the structure within each unit cell dominates the nodal structure of the gap function. We trace its reason to the way in which a Cooper pair is formed across the hybridized molecular orbitals, where we still end up with a T_c much higher than usual.

4 pages, 6 figures

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• d_{x^2-y^2}- vs. d_{xy}- like pairings in organic superconductors κ-(BEDT-TTF)_2 X
• Possible high $T_c$ superconductivity mediated by antiferromagnetic spin fluctuations in systems with Fermi surface pockets
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Cited by in corpus (4)

• Competition between singlet and triplet pairings in Na_xCoO_2 yH_2O
• Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice
• Superconductivity in repulsive electron systems having three-dimensional disconnected Fermi surfaces
• Flat bands in condensed-matter systems -- perspective for magnetism and superconductivity