New Li-Ethylenediamine-Intercalated Superconductor Li$_x$(C$_2$H$_8$N$_2$)$_y$Fe$_{2-z}$Se$_2$ with $T_c$ = 45 K

  title={New Li-Ethylenediamine-Intercalated Superconductor Li\$\_x\$(C\$\_2\$H\$\_8\$N\$\_2\$)\$\_y\$Fe\$\_\{2-z\}\$Se\$\_2\$ with \$T\_c\$ = 45 K},
  author={Takehiro Hatakeda and Takashi Noji and Takayuki Kawamata and Masatsune Kato and Yōji Koike},
  journal={arXiv: Superconductivity},
A new iron-based superconductor Li$_x$(C$_2$H$_8$N$_2$)$_y$Fe$_{2-z}$Se$_2$ with $T_c$ = 45 K has successfully been synthesized via intercalation of dissolved lithium metal in ethylenediamine. The distance between neighboring Fe layers is 10.37 {\AA} and much larger than those of FeSe with $T_c$ = 8 K and K$_x$Fe$_2$Se$_2$ with $T_c$ ~ 30 K. It seems that the high-$T_c$ of Li$_x$(C$_2$H$_8$N$_2$)$_y$Fe$_{2-z}$Se$_2$ is caused by the possible two-dimensional electronic structure due to the large… 

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