Department Chemie der Ludwig-Maximilians-Universität München, München, Germany.
J Phys Condens Matter. 2013 Mar 27;25(12):122203. doi: 10.1088/0953-8984/25/12/122203. Epub 2013 Mar 1.
We report the structural and magnetic phase transitions of triclinic Ca10(FeAs)10(Pt3As8), which is the parent compound of the 1038-type iron-arsenide superconductors. High-resolution x-ray diffraction reveals splitting of the in-plane (a,b) lattice parameters at T(s) ≈ 120 K. Platinum-doping weakens the distortion and shifts the transition temperature to 80 K in Ca10(Fe(1-x)Pt(x)As)10(Pt3As8) with x = 0.03. μSR experiments show the onset of magnetic order near T and a broad magnetic phase transition. The structural transition involves no reduction of the space group symmetry in contrast to the other parent compounds of iron-arsenide superconductors; nevertheless the local fourfold symmetry of the FeAs-layers in Ca10(FeAs)10(Pt3As8) is broken.
我们报告了三方晶系 Ca10(FeAs)10(Pt3As8)的结构和磁相变，它是 1038 型铁砷化物超导体的母体化合物。高分辨率 X 射线衍射揭示了在 T(s) ≈ 120 K 时面内(a，b)晶格参数的劈裂。铂掺杂削弱了这种扭曲，并将 Ca10(Fe(1-x)Pt(x)As)10(Pt3As8)中的转变温度移至 80 K，其中 x = 0.03。μSR 实验表明，在 T 附近出现磁有序和宽的磁相变。与其他铁砷化物超导体的母体化合物不同，结构转变不涉及空间群对称性的降低；然而，Ca10(FeAs)10(Pt3As8)中 FeAs 层的局部四元对称被破坏。
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