Figure 1: Phase diagram of NaFe1−xCoxAs and STM results on parent and optimally doped samples. | Nature Communications

Figure 1: Phase diagram of NaFe1−xCoxAs and STM results on parent and optimally doped samples.

From: Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1−xCoxAs

Figure 1

(a) Schematic electronic phase diagram of NaFe1−xCoxAs in the underdoped regime. The solid symbols mark the SDW and SC transition temperatures of parent (x=0), underdoped (x=0.014), and optimally doped (x=0.028) samples. (b) Temperature dependence of the specific heat and its derivative (inset) of the underdoped sample show the structural, SDW and SC phase transitions. (c) Constant current image of the cleaved surface of parent NaFeAs. (d) The dI/dV spectroscopy taken on the parent compound along the red line in (c). There is a single p–h asymmetric SDW gap that is uniformly distributed in space. (e) Topography of the optimally doped sample, which shows more disorders due to Co doping. (f) The dI/dV spectroscopy taken on the optimally doped sample along the red line in (e) shows a single p–h symmetric SC gap that is also quite homogeneous. Both images consist of 256 × 256 pixels taken on an area of 300 × 300 Å2.

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