Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.187003
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Funding
- Humboldt Foundation
- DFG-SPP [1458/1]
- DFG-FOR [538]
- Princeton Startup Funds
- Sloan Foundation
- NSF [DMR-095242, DMR-0819860]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819860, 952428] Funding Source: National Science Foundation
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We put forward a scenario that explains the difference between the order-parameter character in arsenide (As) and phosphorous (P) iron-based superconductors. Using functional renormalization group to analyze it in detail, we find that nodal superconductivity on the electron pockets (hole pocket gaps are always nodeless) can naturally appear when the hole pocket at (pi, pi) in the unfolded Brillouin zone is absent, as is the case in LaOFeP. There, electron-electron interactions render the gap on the electron pockets softly nodal (of s(+/-) form). When the pocket of d(xy) orbital character is present, intraorbital interactions with the d(xy) part of the electron Fermi surface drives the superconductivity nodeless.
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