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

Takehiro Hatakeda; Takashi Noji; Kazuki Sato; Takayuki Kawamata; Masatsune Kato; Yoji Koike

doi:10.7566/JPSJ.85.103702

paper

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 $T_{c}$ $\sim$ 40 K

arXiv:1609.06017 · doi:10.7566/JPSJ.85.103702

Abstract

New FeSe-based intercalation superconductors, $A_{x}$ (C $_{8}$ H $_{11}$ N) $_{y}$ Fe $_{1 - z}$ Se ( $A$ = Li, Na), with $T_{c}$ = 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 $T_{c}$ and $d$ in the FeSe-based intercalation superconductors is not domic but $T_{c}$ is saturated at ~ 45 K, which is comparable to the $T_{c}$ values of single-layer FeSe films, for $d$ $\geq$ 9 Å.

12 pages, 5 figures, 1 table

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 $T_{c}$ $\sim$ 40 K

Abstract

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New Alkali-Metal- and 2-Phenethylamine-Intercalated Superconductors Ax​(C8​H11​N)y​Fe1−z​Se (A = Li, Na) with the Largest Interlayer Spacings and Tc​ ∼ 40 K

Abstract

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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 $T_{c}$ $\sim$ 40 K