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Point-contact spectroscopy is a powerful tool for probing superconductors.One of the most common observations in the point-contact spectra on therecently discovered ferropnictide superconductors is a large conductanceasymmetry with respect to voltage across the point-contact. In this paper weshow that the antisymmetric part of the point-contact spectrum between a silvertip and an epitaxial thin film of Ba(Fe$_{0.92}$Co$_{0.08}$)$_2$As$_2$ showscertain unique features. These features have an interesting evolution withincreasing temperature up to a temperature that is 30% larger than the criticaltemperature $T_c$ of the superconductor. We argue that this evolution can beassociated with the rich normal state properties of these materials.

Conductance asymmetry in point-contacts on epitaxial thin films of Ba(Fe$_{0.92}$Co$_{0.08}$)$_2$As$_2$