Robust A1 superconductivity in the kagome lattice
Yi Gao
DOI 10.1103/PhysRevB.109.214501 · Physical Review B
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Abstract
We theoretically studied the superconducting pairing in a single-orbital kagome lattice. By taking the electron-electron correlation as the pairing mechanism, we obtained the spin and charge fluctuations based on the random-phase approximation and calculated the preferred pairing function based on the linearized Eliashberg equation. It turns out that the frequency dependence of the Eliashberg equation is of great importance in this model, and may lead to spin-triplet and odd-frequency pairing state. We further found a robust A1 pairing symmetry, with respect to the correlation strength and Fermi surface variation. This pairing state does not break the time-reversal symmetry and can be nodal or nodeless. We concluded that, in the recently discovered kagome superconductors, the preferred pairing symmetry is A1, even if the pairing originates from the electron-electron interaction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| RbV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CsV3Sb5 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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