We report the synthesis of tetragonal FeSxSe1-x films (x : 0.78) by pulsed-laser deposition. To fabricate tetragonal alloy films with tetragonal FeSe and hexagonal FeS targets, we adopted an alternate deposition technique with an FeSe buffer layer on MgO(001). The overall film composition is controlled by the thickness ratio of FeS/FeSe layers. The out-of-plane lattice parameter of the films follows Vegard's law, demonstrating homogeneous alloying by interdiffusion. The sulfur solid solubility reaches x = 0.78 in the FeSxSe1-x films, which is by far higher than x 0.40 in bulk governed by the tetragonal phase instability.
ASJC Scopus subject areas
- Physics and Astronomy(all)