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

Abstract

New FeSe-based intercalation superconductors, $A_x$(C${}_8$H${}_{11}$N)${}_y$Fe${}_{1-z}$Se ($A$ = Li, Na), with $T_{\mathrm{c}}$ = 39-44 K have been successfully synthesized via the intercalation of alkali metals and 2-phenethylamine into FeSe. The interlayer spacings, namely, the distances between neighboring Fe layers, $d$, of $A_x$(C${}_8$H${}_{11}$N)${}_y$Fe${}_{1-z}$Se ($A$ = Li, Na) are 19.04(6) and 18.0(1) Å, respectively. These $d$ values are the largest among those of the FeSe-based intercalation compounds and are understood to be due to the intercalation of two molecules of 2-phenethylamine in series perpendicular to the FeSe layers. It appears that the relationship between $T_{\mathrm{c}}$ and $d$ in the FeSe-based intercalation superconductors is not domic but $T_{\mathrm{c}}$ is saturated at ~ 45 K, which is comparable to the $T_{\mathrm{c}}$ values of single-layer FeSe films, for $d$ $\ge$ 9 Å.

arXiv comment12 pages, 5 figures, 1 table

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Cited by in corpus (8)

• Preformed Cooper pairs in layered FeSe-based superconductors
• Extreme anisotropy and anomalous transport properties of heavily electron doped Lix(NH3)yFe2Se2 single crystals
• Protonation-induced discrete superconducting phases in bulk FeSe single crystals
• New Lithium- and Diamines-Intercalated Superconductors Li${}_x$(C${}_2$H${}_8$N${}_2$)${}_y$TiSe${}_2$ and Li${}_x$(C${}_6$H${}_{16}$N${}_2$)${}_y$TiSe${}_2$
• Superconductivity at 44.4 K achieved by intercalating EMIM+ into FeSe
• Deviation from canonical collective creep behavior in Li${}_{0.8}$Fe${}_{0.2}$OHFeSe
• Synthesis of New Lithium- and Monoamine-Intercalated Superconductors Li${}_x$(C${}_n$H${}_{2n+3}$N)${}_y$Fe${}_{1-z}$Se ($n$ = 6, 8, 18) with the Dramatically Expanded Interlayer Spacing
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates