c-axis nodal lines induced by interlayer pairing in iron-based superconductors
Yuehua Su, Chandan Setty, Ziqiang Wang, Jiangping Hu
DOI 10.1103/PhysRevB.85.184517 · Physical Review B
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Abstract
A layered superconductor with a full pairing energy gap can be driven into a nodal superconducting (SC) state by interlayer pairing when the SC state becomes more quasi-three-dimensional. We propose that this mechanism is responsible for the observed nodal behavior in a class of iron-based SCs. We show that the intra- and interlayer pairings generally compete and the gap nodes develop on one of the hole Fermi surface pockets as they become larger in the iron pnictides. Our results provide a natural explanation of the c-axis gap modulations and gap nodes observed by angle-resolved photoemission spectroscopy. Moreover, we predict that an anticorrelated c-axis gap modulation on the hole and electron pockets should be observable in the S±-wave pairing state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2-xPx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2As1.4P0.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba1-xKxFe2As2 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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