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

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

2002-08-08

arxiv.org/abs/cond-mat/0208164v1

Physics

Condensed Matter

Superconductivity

4 pages, 6 figures

Scientific paper

10.1103/PhysRevB.66.212505

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.

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