Superconductivity in (NH sub(3)) sub(y) Cs sub(0.4) FeSe

Alkali-metal-intercalated FeSe materials, (NH sub(3)) sub(y) M sub(0.4) FeSe (M: K, Rb, and Cs), have been synthesized using the liquid NH sub(3) technique. (NH sub(3)) sub(y)Cs sub(0.4) FeSe shows a superconducting transition temperature (T sub(c)) as high as 31.2 K, which is higher by 3.8 K than t...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-09, Vol.88 (9)
Main Authors: Zheng, Lu, Izumi, Masanari, Sakai, Yusuke, Eguchi, Ritsuko, Goto, Hidenori, Takabayashi, Yasuhiro, Kambe, Takashi, Onji, Taiki, Araki, Shingo, Kobayashi, Tatsuo C, Kim, Jungeun, Fujiwara, Akihiko, Kubozono, Yoshihiro
Format: Article
Language:English
Subjects:
Condensed matter
Correlation
Lattice parameters
Liquids
Nesting
Pressure dependence
Superconductivity
Transition temperature
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Summary:Alkali-metal-intercalated FeSe materials, (NH sub(3)) sub(y) M sub(0.4) FeSe (M: K, Rb, and Cs), have been synthesized using the liquid NH sub(3) technique. (NH sub(3)) sub(y)Cs sub(0.4) FeSe shows a superconducting transition temperature (T sub(c)) as high as 31.2 K, which is higher by 3.8 K than the T sub(c) of nonammoniated Cs sub(0.4) FeSe. The T sub(c) s of (NH sub(3)) sub(y) K sub(0.4) FeSe and (NH sub(3)) sub(y) Rb sub(0.4) FeSe are almost the same as those of nonammoniated K sub(0.4) FeSe and Rb sub(0.4) FeSe. The T sub(c) of (NH sub(3)) sub(y) Cs sub(0.4) FeSe shows a negative pressure dependence. A clear correlation between T sub(c) and lattice constant c is found for ammoniated metal-intercalated FeSe materials, suggesting a correlation between Fermi-surface nesting and superconductivity.
ISSN:1098-0121
1550-235X