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arXiv · 1409.1988

Consistent picture of the octet-nodal gap and its evolution with doping in heavily overdoped Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$

Shun-Li Yu·Zi-Jian Yao·Jian-Xin Li
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Abstract

We investigate the pairing symmetry in heavily overdoped Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ based on the spin-fluctuation mechanism. The exotic octet nodes of the superconducting gap and the unusual evolution of the gap with doping observed by the recent experiments are well explained in a unified manner. We demonstrate that the scatterings of electrons on the Fermi patches is mainly responsible for the incommensurate spin fluctuations and consequently the Fermi-surface-dependent multi-gap structure, since the Fermi level is close to the flat band. In addition, we find that a $d$-wave pairing state will prevail over the s-wave pairing state around the Lifshitz transition point.

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Shun-Li Yu, Zi-Jian Yao, Jian-Xin Li. 2014-09-06. Consistent picture of the octet-nodal gap and its evolution with doping in heavily overdoped Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$. https://doi.org/10.1088/0953-8984/27/50/505701

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