Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li$_x$(C$_6$H$_{16}$N$_2$)$_y$Fe$_{2-z}$Se$_2$: Dependence on the Intercalation Temperature and Lithium Content

The superconductivity and intercalation statein the lithium-and hexamethylenediamine (HMDA)-intercalated superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ have been investigated from powder x-ray diffraction, thermogravimetric and magnetic susceptibility measurements, changing the intercalation temperature, $T_{i}$ , and the Li content, $x$ . Both Li and HMDA have been co-intercalated stably up to $x$ = 2 roughly in the molar ratio of $x : y = 2 : 1$ . In the case of $T_{i}$ = 45 $^{\circ}$ C, it has been found that both Li and HMDA are co-intercalated locally at the edge of FeSe crystals, indicating that both Li and HMDA are hard to diffuse into the inside of FeSe crystals at 45 $^{\circ}$ C. In the case of $T_{i}$ = 100 $^{\circ}$ C, on the other hand, it has been found that both Li and HMDA diffuse into the inside of FeSe crystals, so that $T_{c}$ tends to increase with increasing $x$ from ~30 K at $x$ = 1 up to 38 K at $x$ = 2 owing to the increase of electron carriers doped from Li into the FeSe layers.

Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ : Dependence on the Intercalation Temperature and Lithium Content

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Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ : Dependence on the Intercalation Temperature and Lithium Content

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Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Lixx​(C66​H1616​N22​)yy​Fe2−z2−z​Se22​: Dependence on the Intercalation Temperature and Lithium Content

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Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Lixx​(C66​H1616​N22​)yy​Fe2−z2−z​Se22​: Dependence on the Intercalation Temperature and Lithium Content

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Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ : Dependence on the Intercalation Temperature and Lithium Content

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Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ : Dependence on the Intercalation Temperature and Lithium Content

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