Andreev Reflection Like Enhancement Above Bulk $T_c$ in Electron Underdoped Iron Arsenides

H. Z. Arham, C. R. Hunt, J. Gillett +5

We use point contact spectroscopy (PCS) to probe the superconducting properties of electron doped $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$ ($\mathrm{x}=0.05,0.055,0.07,0.08$) and hole doped…