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
DOI 10.1103/PhysRevLett.112.127001 · Physical Review Letters
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Abstract
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 fourfold rotational symmetry is broken macroscopically, the QPI patterns reveal strong rotational anisotropy. At optimal doping, however, the QPI patterns are always fourfold 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaFe1-xCoxAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | unknown |
| NaFe1-xCoxAs 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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