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Point contact spectroscopy (PCS) is a technique which can reveal the size andsymmetry of a superconducting gap ($\Delta$) and is especially useful for newmaterials such as the iron-based superconductors. PCS is usually employed inconjunction with the extended Blonder-Tinkham-Klapwijk (BTK) model which isused to extract information such as the existence of nodes in $\Delta$ from PCSdata obtained on unconventional superconductors. The BTK model uses adimensionless parameter $Z$ to quantify the barrier strength across a normalmetal - superconductor junction. We have used a unique feature of PCS whichallows variation of $Z$ to obtain crucial information about $\Delta$. We reportour $Z$-dependent, $a-b$ plane PCS measurements on single crystals of theiron-based superconductor BaFe$_{2-x}$Co$_{x}$As$_{2}$. Our measurements showthat BaFe$_{2-x}$Co$_{x}$As$_{2}$ ($x$=0.148) is a superconductor with two gapswhich does not contain any nodes. The $Z$ dependent point contact spectra ruleout a pure $d$ symmetry and the gaps at optimal doping have negligibleanisotropy.

$a-b$ Plane Point Contact Spectroscopy measurements of optimally Cobalt doped Ba-122 iron-pnictide superconductors