Neutron Scattering Science Division, Oak Ridge National Laboratory, Tennessee 37831, USA.
Phys Rev Lett. 2011 Sep 23;107(13):137003. doi: 10.1103/PhysRevLett.107.137003. Epub 2011 Sep 19.
Single-crystal neutron diffraction studies on superconductors A(2)Fe(4)Se(5), where A=Rb, Cs, (Tl, Rb), and (Tl, K) (T(c) ∼ 30 K), uncover the same Fe vacancy ordered crystal structure and the same block antiferromagnetic order as in K(2)Fe(4)Se(5). 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 ∼3.3μ(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.
对超导 A(2)Fe(4)Se(5)（其中 A=Rb、Cs、(Tl,Rb) 和 (Tl,K)（T(c)∼30 K））的单晶中子衍射研究揭示了与 K(2)Fe(4)Se(5)相同的 Fe 空位有序晶体结构和相同的块体反铁磁有序。Fe 有序-无序转变发生在 T(S)=500-578 K，反铁磁转变发生在 T(N)=471-559 K，在 10 K 时有序磁矩约为 3.3μ(B)/Fe。因此，最近发现的所有 A 插层铁硒化物超导体都具有共同的晶体和磁结构，这与以前的 Fe 基超导体家族非常不同，构成了一个独特的新 245 家族。
