Evidence of Inhomogeneous Superconductivity in FeTe1-xSex by Scotch-Tape Method

We have fabricated thin films of FeTe 1-x Se x using a scotch-tape method. The superconductivities of the thin films are different from each other although these films were fabricated from the same bulk sample. The result clearly presents the inhomogeneous superconductivity in FeTe 1-x Se x . The difference might arise from inhomogeneity due to the excess Fe concentration. The resistivity of a thin film with low excess Fe shows good superconductivity with the sharp superconducting-transition width and more isotropic superconductivity.