Journal
CHINESE PHYSICS B
Volume 22, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/22/8/087412
Keywords
superconductivity; iron-based superconductor; liquid ammonia; critical temperature
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Funding
- National Natural Science Foundation of China [90922037, 51072226, 51202286]
- Chinese Academy of Sciences
- International Center for Diffraction Data (ICDD)
- Beijing Nova Program, China [2011096]
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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 similar to 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, KxFe2Se2(NH3)(y) (x approximate to 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.
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