Evidence of Inhomogeneous Superconductivity in FeTe$_{1-x}$Se$_x$ Thin Film Using Scotch-Tape Method

摘要

We have fabricated thin films of FeTe$_{1-x}$Se$_x$ using a scotch-tapemethod. The superconductivities of the thin films are different from each otheralthough these films were fabricated from the same bulk sample. The resultclearly presents the inhomogeneous superconductivity in FeTe$_{1-x}$Se$_x$. Thedifference comes from inhomogeneity due to the excess Fe concentration. Theresistivity of a thin film with low excess Fe shows good superconductivity withthe sharp superconducting-transition width and more isotropicsuperconductivity.