Research Progress of Fe(Se,Te) Superconducting Films

Abstract:

Because of the special dimension effect and interface effect, film materials have unique advantages compared with bulk materials. Fe(Se,Te), an iron-sulfur superconductor, is more conducive to the study on superconducting mechanism because of its simple crystal structure. It has been found that single-layer FeSe superconducting films grown on SrTiO₃ (STO) substrate significantly increase the superconducting transition temperature (T_c), which makes the study on FeSe superconducting films a new direction to understand the mechanism of unconventional superconductors. In addition, it is also found that the critical transition temperature of FeSe multilayer films is higher than that of bulk materials. The recent research achievements on the preparation of Fe(Se,Te) superconducting films and the enhancement of T_c by stress effect and interface effect were reviewed.