New Superconducting Phase of Lix(C6H16N2)yFe2-zSe2 with Tc = 41K Obtained through the Post-Annealing

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

doi:10.7566/JPSJ.85.013702

New Superconducting Phase of Li_x(C₆H₁₆N₂)_yFe_2-zSe₂ with T_c = 41K Obtained through the Post-Annealing

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

ENG - Applied Physics

Tohoku University

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

Post-annealing effects on the crystal structure and superconductivity of the lithium- and hexamethylenediamine (HMDA)-intercalated superconductor Li_x(C₆H₁₆N₂)_yFe_2-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 Li_x(C₆H₁₆N₂)_yFe_2-zSe₂ with d = 10.30(2)Å and T_c = 41K 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 T_c increases with a decrease in d through the post-annealing is discussed.

Original language	English
Article number	013702
Journal	Journal of the Physical Society of Japan
Volume	85
Issue number	1
DOIs	https://doi.org/10.7566/JPSJ.85.013702
Publication status	Published - 2016 Jan 15

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title = "New Superconducting Phase of Lix(C6H16N2)yFe2-zSe2 with Tc = 41K Obtained through the Post-Annealing",

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){\AA} and Tc = 41K 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.",

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T1 - New Superconducting Phase of Lix(C6H16N2)yFe2-zSe2 with Tc = 41K Obtained through the Post-Annealing

AU - Hosono, Shohei

AU - Noji, Takashi

AU - Hatakeda, Takehiro

AU - Kawamata, Takayuki

AU - Kato, Masatsune

AU - Koike, Yoji

PY - 2016/1/15

Y1 - 2016/1/15

N2 - 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 = 41K 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.

AB - 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 = 41K 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.

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New Superconducting Phase of Li_x(C₆H₁₆N₂)_yFe_2-zSe₂ with T_c = 41K Obtained through the Post-Annealing

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