New Superconducting Phase of Li$_x$(C$_6$H$_{16}$N$_2$)$_y$Fe$_{2-z}$Se$_2$ with $T_\textrm{c}$ = 41 K Obtained through the Post-Annealing

Shohei Hosono; Takashi Noji; Takehiro Hatakeda; Takayuki Kawamata; Masatsune Kato; Yoji Koike

doi:10.7566/JPSJ.85.013702

paper

New Superconducting Phase of Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ with $T_{c}$ = 41 K Obtained through the Post-Annealing

arXiv:1604.03262 · doi:10.7566/JPSJ.85.013702

Abstract

Post-annealing effects on the crystal structure and superconductivity of the lithium- and hexamethylenediamine (HMDA)-intercalated superconductor Lix(C6H16N2)yFe2-zSe2 have been investigated. Through the post-annealing, a two-step reduction of the interlayer spacing between neighboring Fe layers, d, has been observed. It has been found that a new phase of Lix(C6H16N2)yFe2-zSe2 with d= 10.30(2) Å and Tc = 41 K different from the as-intercalated phase is stabilized owing to the possible stable inclination of HMDA intercalated between FeSe layers. This result supports the domic relation between Tc and d in the FeSe-based intercalation superconductors. The reason why Tc increases with a decrease in d through the post-annealing is discussed.

arXiv comment12 pages, 6 figures

New Superconducting Phase of Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ with $T_{c}$ = 41 K Obtained through the Post-Annealing

Abstract

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New Superconducting Phase of Lix​(C6​H16​N2​)y​Fe2−z​Se2​ with Tc​ = 41 K Obtained through the Post-Annealing

Abstract

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Cited by in corpus (16)

New Superconducting Phase of Li $_{x}$ (C $_{6}$ H $_{16}$ N $_{2}$ ) $_{y}$ Fe $_{2 - z}$ Se $_{2}$ with $T_{c}$ = 41 K Obtained through the Post-Annealing