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Sebastian","submitted_at":"2013-07-07T19:43:17Z","abstract_excerpt":"We use point contact spectroscopy (PCS) to probe the superconducting properties of electron doped $\\rm{Ba(Fe_{1-x}Co_x)_2As_2}$ ($\\rm{x = 0.05, 0.055, 0.07, 0.08}$) and hole doped $\\rm{Ba_{0.8}K_{0.2}Fe_2As_2}$. PCS directly probes the low energy density of states via Andreev reflection, revealing two distinct superconducting gaps in both compound families. Apart from the electron underdoped $\\rm{Ba(Fe_{1-x}Co_{x})_2As_2}$, the excess current due to Andreev reflection for the compounds follows the typical BCS temperature dependence. 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