Anisotropic but Nodeless Superconducting Gap in the Presence of Spin-Density Wave in Iron-Pnictide Superconductor NaFe1−xCoxAs
Q. Q. Ge (葛青亲), Z. R. Ye (叶子荣), M. Xu (徐敏), Y. Zhang (张焱), J. Jiang (姜娟), B. P. Xie (谢斌平), Y. Song (宋宇), C. L. Zhang (张承林), Pengcheng Dai (戴鹏程), D. L. Feng (封东来)
DOI 10.1103/PhysRevX.3.011020 · Physical Review X
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Abstract
The coexisting regime of spin-density wave (SDW) and superconductivity in iron pnictides represents a novel ground state. We have performed high-resolution angle-resolved photoemission measurements on NaFe1−xCoxAs (x=0.0175) in this regime and revealed its distinctive electronic structure, which provides some microscopic understandings of its behavior. The SDW signature and the superconducting gap are observed on the same bands, illustrating the intrinsic nature of the coexistence. However, because the SDW and superconductivity are manifested in different parts of the band structure, their competition is nonexclusive. Particularly, we find that the gap distribution is anisotropic and nodeless, in contrast to the isotropic superconducting gap observed in a SDW-free NaFe1−xCoxAs (x=0.045), which puts strong constraints on theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaFe0.9825Co0.0175As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.5 | Pressure not reported | onset |
| NaFe0.9825Co0.0175As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | zero_resistance |
| NaFe0.955Co0.045As Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
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