We report that the strong flux pinning of (Ba, K)Fe2As2 thin films is induced by the superconducting phase distribution characteristics. Depending on the growth conditions, our thin films have distribution diversity which can induce various superconducting properties. The activation energy is one of the parameters representing pinning forces. We compare the activation energy of two different distributions, which has 16780 K and 5900 K, respectively. The sample of higher activation energy forms a mesh-textured-like distribution which has delta-Tc pinning mechanism while the lower activation energy sample has an intrinsic pinning mechanism. Moreover these distributions are achieved from EPMA elemental mapping which modified by overlay method. We conclude that superconducting phase distribution have strong relation to the flux pinning potential in the (Ba, K)Fe2As2 films.
|Submitters Country||South Korea|