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We have succeeded in observing zero-resistivity in newly discoveredintercalation superconductors Ax(C2H8N2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K,using the sintered pellet samples. The electrical resistivity, \r{ho}, in thenormal state is metallic and Tconset defined in the $\rho$ measurements, is ashigh as ~ 57 K. We have also investigated effects of the atmospheric exposurein Lix(C2H8N2)yFe2-zSe2. It has been found that both the crystal structure andsuperconductivity are maintained at least up to several days, indicating thismaterial is comparatively resistant to the atmospheric exposure.

Resistive superconducting transition and effects of atmospheric exposure in the intercalation superconductor Ax(C2H8N2)yFe2-zSe2 (A = Li, Na)