Fast synthesis of Fe1.1Se1−xTex superconductors in a self-heating and furnace-free way

Highlights: • Fast combustion synthesis is employed to synthesize iron-based superconductors. • The synthesized samples show clear zero resistivity and magnetic susceptibility drop. • Fe_1.1Se_0.33Te_0.67 shows onset T_c of 14 K and upper critical field of about 54 T. A fast and furnace-free method of combustion synthesis is employed for the first time to synthesize iron-based superconductors. Using this method, Fe_1.1Se_{1 − x}Te_x (0 ≤ x ≤ 1) samples can be prepared from self-sustained reactions of element powders in only tens of seconds. The obtained Fe_1.1Se_{1 − x}Te_x samples show clear zero resistivity and corresponding magnetic susceptibility drop at around 10–14 K. The Fe_1.1Se_0.33Te_0.67 sample shows the highest onset T_c of about 14 K, and its upper critical field is estimated to be approximately 54T. Compared with conventional solid state reaction for preparing polycrystalline FeSe samples, combustion synthesis exhibits much-reduced time and energy consumption, but offers comparable superconducting properties. It is expected that the combustion synthesis method is available for preparing plenty of iron-based superconductors, and in this direction further work is being in progress.