期刊
PHYSICAL REVIEW B
卷 82, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.140504
关键词
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资金
- Japan Science and Technology Agency (JST)
The pairing symmetry of BaFe(2-)xCo(x)As(2) was investigated by Raman scattering. The gap structure appears only in the B-2g symmetry inconsistent with Muschler et al. [Phys. Rev. B 80, 180510 (R) (2009)]. They concluded that the gap symmetry is the extended s with the argument that the B-2g spectra probe the electron pocket. Our calculation using the realistic band parameter, however, shows that the B-2g spectra are derived from mainly the hole pocket. The calculated intensity is much stronger in A(1g) than in B-2g but the observed A1g spectra have no gap structure. This inconsistency is removed, if the orbital combination is introduced in the pairing symmetry. That is, the symmetry of orbital combination is B-2g and that of momentum space is A1g. The energy of the gap peak is smaller than the gap energy of the hole pocket, indicating the observed peak is the resonant peak created in the gap of the s +/- superconductor.
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