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$_2$

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

doi:10.7566/JPSJ.86.104701

paper

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 $_{2}$

arXiv:1709.03779 · doi:10.7566/JPSJ.86.104701

Abstract

New intercalation superconductors of Li $_{x}$ (C $_{2}$ H $_{8}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$ and Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$ with $T_{c}$ = 4.2 K have successfully been synthesized via the co-intercalation of lithium and ethylenediamine or hexamethylenediamine into 1T-TiSe $_{2}$ . Moreover, it has been found that both intercalation compounds of Li $_{x}$ TiSe $_{2}$ and (C $_{2}$ H $_{8}$ N $_{2}$ ) $_{y}$ TiSe $_{2}$ also show superconductivity with $T_{c}$ = 2.4 K and 2.8 K, respectively. These results indicate that both the electron doping due to the intercalation of lithium and the expansion of the interlayer spacing between TiSe2 layers due to the intercalation of diamines suppress the charge density wave in 1T-TiSe $_{2}$ , leading to the appearance of superconductivity.

17 pages, 8 figures, 1 table

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 $_{2}$

Abstract

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New Lithium- and Diamines-Intercalated Superconductors Lix​(C2​H8​N2​)y​TiSe2​ and Lix​(C6​H16​N2​)y​TiSe2​

Abstract

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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 $_{2}$