Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.137003
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Funding
- NSFC [11034012, 10974175, 10934005]
- 973 Program [2011CBA00112, 2011CBA00103, 2009CB929104]
- Division of Scientific User Facilities, DOE OBES
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Single-crystal neutron diffraction studies on superconductors A(2)Fe(4)Se(5), where A Rb, Cs, (Tl, Rb), and (Tl, K) (T-c similar to 30 K), uncover the same Fe vacancy ordered crystal structure and the same block antiferromagnetic order as in K2Fe4Se5. The Fe order-disorder transition occurs at T-S = 500-578 K, and the antiferromagnetic transition at T-N = 471-559 K with an ordered magnetic moment similar to 3.3 mu(B)/Fe at 10 K. Thus, all recently discovered A intercalated iron selenide superconductors share the common crystalline and magnetic structure, which are very different from previous families of Fe-based superconductors, and constitute a distinct new 245 family.
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