Synthesis and post-annealing effects of alkaline-metal-ethylenediamine- intercalated superconductors Ax(C2H8N 2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K

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

doi:10.1016/j.physc.2014.01.007

Synthesis and post-annealing effects of alkaline-metal-ethylenediamine- intercalated superconductors A_x(C₂H₈N ₂)_yFe_2-zSe₂ (A = Li, Na) with T_c = 45 K

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

ENG - Applied Physics

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

55 Citations (Scopus)

Abstract

New iron-based intercalation superconductors A_x(C ₂H₈N₂)_yFe_2- _zSe₂ (A = Li, Na) with T_c = 45 K have successfully been synthesized via intercalation of dissolved alkaline metal in ethylenediamine. The c-axis lengths of A_x(C₂H ₈N₂)_yFe_2-zSe₂ (A = Li, Na) are 20.74(7) Å and 21.9(1) Å, respectively, and are about 50% larger than that of K_xFe₂Se₂, indicating that not only alkaline metal but also ethylenediamine is intercalated between the Se-Se layers of FeSe. It seems that the high-T_c of A_x(C₂H₈N₂)_yFe _2-zSe₂ (A = Li, Na) is caused by the possible two-dimensional electronic structure due to the large c-axis length. Through the post-annealing in an evacuated glass tube, it has been found that T_c decreases with increasing post-annealing temperature and that deintercalation of EDA from the as-intercalated sample takes place at low temperatures below 250 °C.

Original language	English
Pages (from-to)	8-11
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	504
DOIs	https://doi.org/10.1016/j.physc.2014.01.007
Publication status	Published - 2014 Sep 15

Keywords

Alkaline metal
Etylenediamine
FeSe
Intercalation
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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Synthesis and post-annealing effects of alkaline-metal-ethylenediamine- intercalated superconductors A_x(C₂H₈N ₂)_yFe_2-zSe₂ (A = Li, Na) with T_c = 45 K. / Noji, Takashi; Hatakeda, Takehiro; Hosono, Shohei; Kawamata, Takayuki ; Kato, Masatsune; Koike, Yoji.

In: Physica C: Superconductivity and its applications, Vol. 504, 15.09.2014, p. 8-11.

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

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title = "Synthesis and post-annealing effects of alkaline-metal-ethylenediamine- intercalated superconductors Ax(C2H8N 2)yFe2-zSe2 (A = Li, Na) with Tc = 45 K",

abstract = "New iron-based intercalation superconductors Ax(C 2H8N2)yFe2- zSe2 (A = Li, Na) with Tc = 45 K have successfully been synthesized via intercalation of dissolved alkaline metal in ethylenediamine. The c-axis lengths of Ax(C2H 8N2)yFe2-zSe2 (A = Li, Na) are 20.74(7) {\AA} and 21.9(1) {\AA}, respectively, and are about 50% larger than that of KxFe2Se2, indicating that not only alkaline metal but also ethylenediamine is intercalated between the Se-Se layers of FeSe. It seems that the high-Tc of Ax(C2H8N2)yFe 2-zSe2 (A = Li, Na) is caused by the possible two-dimensional electronic structure due to the large c-axis length. Through the post-annealing in an evacuated glass tube, it has been found that Tc decreases with increasing post-annealing temperature and that deintercalation of EDA from the as-intercalated sample takes place at low temperatures below 250 °C.",

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AU - Kato, Masatsune

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AB - New iron-based intercalation superconductors Ax(C 2H8N2)yFe2- zSe2 (A = Li, Na) with Tc = 45 K have successfully been synthesized via intercalation of dissolved alkaline metal in ethylenediamine. The c-axis lengths of Ax(C2H 8N2)yFe2-zSe2 (A = Li, Na) are 20.74(7) Å and 21.9(1) Å, respectively, and are about 50% larger than that of KxFe2Se2, indicating that not only alkaline metal but also ethylenediamine is intercalated between the Se-Se layers of FeSe. It seems that the high-Tc of Ax(C2H8N2)yFe 2-zSe2 (A = Li, Na) is caused by the possible two-dimensional electronic structure due to the large c-axis length. Through the post-annealing in an evacuated glass tube, it has been found that Tc decreases with increasing post-annealing temperature and that deintercalation of EDA from the as-intercalated sample takes place at low temperatures below 250 °C.

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