  Whether or not epitaxially grown superconducting films have the same
bulk-like superconducting properties is an important concern. We report the
structure and the electronic properties of epitaxially grown Ba(Fe1-xCox)2As2
films using scanning tunneling microscopy and scanning tunneling spectroscopy
(STS). This film showed a different surface structure, (2sqrtx2sqrt2)R45
reconstruction, from those of as-cleaved surfaces from bulk crystals. The
electronic structure of the grown film is different from that in bulk, and it
is notable that the film exhibits the same superconducting transport
properties. We found that the superconducting gap at the surface is screened at
the Ba layer surface in STS measurements, and the charge density wave was
observed at the surface in sample in the superconducting state.
