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Doping dependence of the anisotropic quasiparticle interference in NaFe1-xCoxAs iron-based superconductors

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arxiv 1403.0090 v1 pith:Q3YFSFQO submitted 2014-03-01 cond-mat.supr-con cond-mat.str-el

Doping dependence of the anisotropic quasiparticle interference in NaFe1-xCoxAs iron-based superconductors

Peng Cai , Wei Ruan , Xiaodong Zhou , Cun Ye , Aifeng Wang , Xianhui Chen , Dung-Hai Lee , Yayu Wang This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords nematicdopingcooperdependencefluctuationfour-foldinterferenceiron-based
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We use scanning tunneling microscopy to investigate the doping dependence of quasiparticle interference (QPI) in NaFe1-xCoxAs iron-based superconductors. The goal is to study the relation between nematic fluctuations and Cooper pairing. In the parent and underdoped compounds, where four-fold rotational symmetry is broken macroscopically, the QPI patterns reveal strong rotational anisotropy. At optimal doping, however, the QPI patterns are always four-fold symmetric. We argue this implies small nematic susceptibility and hence insignificant nematic fluctuation in optimally doped iron pnictides. Since Tc is the highest this suggests nematic fluctuation is not a prerequistite for strong Cooper pairing.

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