期刊
PHYSICAL REVIEW X
卷 1, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.1.011009
关键词
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资金
- Institute of Physics, CAS
- DFG [SPP 1458/1]
- Feodor Lynen Fellowship of the Humboldt Foundation
- NSF [DMR-095242]
- Princeton Startup Funds
- Sloan Foundation
- NSF China [11050110420]
- MRSEC at Princeton University, NSF [DMR-0819860]
Using self-consistent mean-field and functional renormalization-group approaches, we show that s-wave pairing symmetry is robust in the heavily electron-doped iron chalcogenides AFe(2-x)Se(2), where A = K,Cs. Recent neutron scattering experiments suggest that the effective nearest-neighbor spin exchange may be ferromagnetic in chalcogenides. This is different from the iron pnictides, where the nearest-neighbor magnetic exchange coupling is believed to be antiferromagnetic and leads to strong competition between s-wave and d-wave pairing in the electron-overdoped region. Our finding of a robust s-wave pairing in (K,Cs)Fe2-xSe2 differs from the d-wave pairing result obtained by other theories where nonlocal bare interaction terms and the next-to-nearest-neighbor J(2) term are underestimated. Detecting the pairing symmetry in (K,Cs)Fe2-xSe2 may hence provide important insights regarding the mechanism of superconducting pairing in iron-based superconductors.
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