Interorbital pairing and its physical consequences for iron pnictide superconductors
Yi Gao, Wu-Pei Su, Jian-Xin Zhu
DOI 10.1103/PhysRevB.81.104504 · Physical Review B
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Abstract
We study interorbital pairings of iron pnictide superconductors within a minimal two-orbital tight-binding model. We find that in real space, a set of self-consistently determined pairing order parameters forms two sublattices with a relative phase of π and the pairing symmetry is dx2−y2∼cos kx−cos ky. In momentum space, it corresponds to the η pairing proposed by Yang [Phys. Rev. Lett. 63, 2144 (1989)], with nonzero momenta of Cooper pairs. One physical consequence of this type of pairing is the existence of a significant amount of zero energy (gapless) states around the Fermi surface even in the absence of disorder, which contradicts current experiments thus excluding such a pairing in iron pnictide superconductors.
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