Hybridization-induced superconductivity from electron repulsion on a tetramer lattice having a disconnected Fermi surface
Takashi Kimura, Yuji Zenitani, Kazuhiko Kuroki, Ryotaro Arita, Hideo Aoki
DOI 10.1103/PhysRevB.66.212505 · Physical Review B
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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 Tc much higher than usual.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaB2C2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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