Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor with Tc=27 K
Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor with Tc=27 K
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DOI：
10.1088/0953-8984/23/5/052203
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发表时间：
2011-02-09
影响因子：
2.7
通讯作者：
Conder, K.
中科院分区：
文献类型：
--
作者：
Krzton-Maziopa, A.;Shermadini, Z.;Conder, K.
我们报道了一种新的FeSe层超导体Cs-0.8（FeSe0.98）的大单晶的合成(2)。采用x射线粉末衍射、中子粉末衍射和磁化测量等方法，比较了Cs-0.8(FeSe0.98)(2)与新近发现的钾插层体系KxFe2Se2的晶体结构和磁性能。新化合物Cs-0.8(FeSe0.98)(2)的超导转变温度（T-c = 27.4 K）略低于K-0.8(FeSe0.98)(2)的29.5 in。用c代替K使晶胞体积增大，c参数从14.1353（13）埃增大到15.2846（11）埃。对于目前已知的碱金属插入层状化合物(K0.8Fe2Se2和Cs-0.8(FeSe0.98)(2))，发现T-c对阴离子高度（Fe层和Se层之间的距离）的依赖类似于对含砷铁超导体和Fe(Se（1-x)Ch(x)）的报道，其中Ch = Te， S。
We report on the synthesis of large single crystals of a new FeSe layer superconductor Cs-0.8(FeSe0.98)(2). X-ray powder diffraction, neutron powder diffraction and magnetization measurements have been used to compare the crystal structure and the magnetic properties of Cs-0.8(FeSe0.98)(2) with those of the recently discovered potassium intercalated system KxFe2Se2. The new compound, Cs-0.8(FeSe0.98)(2), shows a slightly lower superconducting transition temperature (T-c = 27.4 K) in comparison to 29.5 in (K-0.8(FeSe0.98)(2)). The volume of the crystal unit cell increases by replacing K by Cs-the c parameter grows from 14.1353(13) to 15.2846(11) angstrom. For the alkali metal intercalated layered compounds known so far, (K0.8Fe2Se2 and Cs-0.8(FeSe0.98)(2)), the T-c dependence on the anion height (distance between Fe layers and Se layers) was found to be analogous to those reported for As-containing Fe superconductors and Fe(Se(1-x)Ch(x)), where Ch = Te, S.