Pairing symmetry of the multiorbital pnictide superconductor BaFe1.84Co0.16As2 from Raman scattering
S. Sugai, Y. Mizuno, K. Kiho, M. Nakajima, C. H. Lee, A. Iyo, H. Eisaki, S. Uchida
DOI 10.1103/PhysRevB.82.140504 · Physical Review B
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Abstract
The pairing symmetry of BaFe2−xCoxAs2 was investigated by Raman scattering. The gap structure appears only in the B2g 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 B2g spectra probe the electron pocket. Our calculation using the realistic band parameter, however, shows that the B2g spectra are derived from mainly the hole pocket. The calculated intensity is much stronger in A1g than in B2g 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 B2g 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| BaFe1.85Co0.15As2 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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