Exploring FeSe-based superconductors by liquid ammonia method

doi:10.1088/1674-1056/22/8/087412

Abstract Our recent progress on the preparation of a series of new FeSe-based superconductors and the clarification of SC phases in potassium-intercalated iron selenides are reviewed here. By the liquid ammonia method, metals Li, Na, Ca, Sr, Ba, Eu, and Yb are intercalated in between FeSe layers and form superconductors with transition temperatures of 30 K～46 K, which cannot be obtained by high-temperature routes. In the potassium-intercalated iron selenides, we demonstrate that at least two SC phases exist, K_xFe₂Se₂(NH₃)_y (x ≈ 0.3 and 0.6), determined mainly by the concentration of potassium. NH₃ has little, if any, effect on superconductivity, but plays an important role in stabilizing the structures. All these results provide a new starting point for studying the intrinsic properties of this family of superconductors, especially for their particular electronic structures.

Keywords: superconductivity iron-based superconductor liquid ammonia critical temperature

Received: 08 June 2013
Accepted manuscript online:

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	74.25.-q	(Properties of superconductors)
	74.62.Bf	(Effects of material synthesis, crystal structure, and chemical composition)
	74.25.Dw	(Superconductivity phase diagrams)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 90922037, 51072226, and 51202286), the Chinese Academy of Sciences, the International Center for Diffraction Data (ICDD), and the Beijing Nova Program, China (Grant No. 2011096).

Corresponding Authors: Chen Xiao-Long
E-mail: chenx29@iphy.ac.cn

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Ying Tian-Ping (应天平), Wang Gang (王刚), Jin Shi-Feng (金士锋), Shen Shi-Jie (申士杰), Zhang Han (张韩), Zhou Ting-Ting (周婷婷), Lai Xiao-Fang (赖晓芳), Wang Wan-Yan (王皖燕), Chen Xiao-Long (陈小龙) Exploring FeSe-based superconductors by liquid ammonia method 2013 Chin. Phys. B 22 087412

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