Abstract
In order to spectroscopically probe the superconducting energy gap of potassium-doped Ba122 iron pnictides, in particular Ba(1-x)KxFe2As2 where x = 0.33 (under-doped regime), we have performed four-wire conductance measurements from T = 2K to 52K. We report evidence for multi-gap features with gaps corresponding to directional tunneling through the ab- axes of this iron pnictide. The multi-gap features a predominant result of tunneling across the ab- plane with gaps of Δ1 = 2-4 meV and Δ2 = 9-11 meV. These gap values are temperature dependent.
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