Reproduction of Experimental Gap Structure in LiFeAs based on the Orbital-Spin Fluctuation Theory: -wave, -wave, and hole--wave states
arXiv:1402.2398 · doi:10.1103/PhysRevB.90.035102
Abstract
The absence of nesting between electron and hole-pockets in LiFeAs with K attracts great attention, as an important hint to understand the pairing mechanism of Fe-based superconductors. Here, we study the five-orbital model of LiFeAs based on the recently-developed orbital-spin fluctuation theories. It is found that the experimentally observed gap structure of LiFeAs, which is a "fingerprint" of the pairing mechanism, is quantitatively reproduced in terms of the orbital-fluctuation-mediated -wave state. Especially, the largest gap observed on the small two hole-pockets composed of () orbitals can be explained, and this is a hallmark of the orbital-fluctuation-mediated superconductivity. The -wave gap structure becomes more anisotropic in the presence of weak spin fluctuations. As the spin fluctuations increase, we obtain the "hole--wave state", in which only the gap of the large hole-pocket made of -orbital is sign-reversed, due to the cooperation of orbital and spin fluctuations. %out of the five pockets. This gap structure with "sign-reversal between hole-pockets" is similar to that recently reported in (Ba,K)FeAs.
arXiv comment11 pages, 10 figures, figures and explanations have been revised, to be published in Phys. Rev. B
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