Superconductivity in repulsive electron systems with three-dimensional disconnected Fermi surfaces
Seiichiro Onari, Ryotaro Arita, Kazuhiko Kuroki, Hideo Aoki
DOI 10.1103/PhysRevB.68.024525 · Physical Review B
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Abstract
The idea of raising Tc in the spin-fluctuation mediated superconductivity on disconnected Fermi surfaces with the gap function changing sign across but not within the Fermi pockets, proposed by Kuroki and Arita for two dimensions, is here extended to three-dimensional (3D) systems. Two typical cases of 3D disconnected Fermi surfaces (stacked bond-alternating lattice and stacked ladder layers) are considered. By solving Eliashberg’s equation for Green’s function obtained with the fluctuation exchange approximation for the repulsive Hubbard model on these structures, we have shown that Tc can indeed reach O(0.01t), which is almost an order of magnitude higher than in ordinary 3D cases and similar to those for the best case found in two dimensions. The key factor found here for the favorable condition for the superconductivity on disconnected Fermi surfaces is that the system should be quasi-low-dimensional, and the peak in the spin susceptibility should be appropriately “blurred.”
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ce(Rh,Ir,Co)In5 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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