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

Abstract

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

5 pages, 6 figures

References in corpus (5)

• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Observation of superconductivity at 30 K~46 K in AxFe2Se2 (A = Li, Na, Ba, Sr, Ca, Yb, and Eu)
• Synthesis of a new alkali metal-organic solvent intercalated iron selenide superconductor with Tc{\approx}45K
• Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y
• New Li-Ethylenediamine-Intercalated Superconductor Li${}_x$(C${}_2$H${}_8$N${}_2$)${}_y$Fe${}_{2-z}$Se${}_2$ with $T_c$ = 45 K

Cited by in corpus (3)

• The intercalation chemistry of layered iron chalcogenide superconductors
• New Superconducting Phase of Li${}_x$(C${}_6$H${}_{16}$N${}_2$)${}_y$Fe${}_{2-z}$Se${}_2$ with $T_{\text{c}}$ = 41 K Obtained through the Post-Annealing
• New Alkali-Metal- and 2-Phenethylamine-Intercalated Superconductors $A_x$(C${}_8$H${}_{11}$N)${}_y$Fe${}_{1-z}$Se ($A$ = Li, Na) with the Largest Interlayer Spacings and $T_{\mathrm{c}}$ $\sim$ 40 K