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The discovery of superconductivity in alkali-ammonia co-intercalated FeSe hasgenerated intensive interest because of their highest Tc (~ 45 K) amongiron-chalcogenide superconductors with bulk form. Here, we report the phasediagrams of two series of Li/Na-ammonia co-intercalated FeSe1-zTez. Whensuperconductivity is suppressed by Te doping, the magnetic ordering states areemergent. Moreover, a novel phase Lix(NH3)yFe2-{\delta}Te2 with possibleantiferromagnetism is discovered. This strongly indicates the intimate relationbetween superconductivity and magnetism in these materials, like in otheriron-based superconductors. On the other hand, comparative structure analysiswith FeSe1-zTez suggests that although there is remarkable similarity in phasediagrams for both iron-chalcogenide and iron-pnictide superconductors, thedifferent types of anions with different charges lead to the dissimilarcontrolling factors in superconductivity for both classes of materials. Thisopens up an opportunity to tune the superconductivity in iron-chalcogenidesuperconductors in more ways than just one.

Emergence of magnetism and controlling factors of superconductivity in Li/Na-ammonia co-intercalated FeSe1-zTez