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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Phase transition in CaFeAsH: bridging 1111 and 122 iron- based superconductors
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Phase transition in CaFeAsH: bridging 1111 and 122 iron- based superconductors

机译：CafeSh中的相变：桥接1111和122基于铁的超导体

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摘要

Iron-based superconductors can be categorized into two types of parent compounds by considering the nature of their temperature-induced phase transitions; namely, first order transitions for 122- and 11-type compounds and second-order transitions for 1111-type compounds. This work examines the structural and magnetic transitions (ST and MT) of CaFeAsH by specific heat, X-ray diffraction, neutron diffraction, and electrical resistivity measurements. Heat capacity measurements revealed a second-order phase transition that accompanies an apparent single peak at 96 K. However, a clear ST from the tetragonal to orthorhombic phase and an MT from the paramagnetic to the antiferromagnetic phase were detected. The structural (T-s) and Neel temperatures (T-N) were respectively determined to be 95(2) and 96 K by X-ray and neutron diffraction and resistivity measurements. This small temperature difference, T-s - T-N, was attributed to strong magnetic coupling in the inter-layer direction owing to CaFeAsH having the shortest lattice constant c among parent 1111-type iron arsenides. Considering that a first-order transition takes place in 11- and 122-type compounds with a short inter-layer distance, we conclude that the nature of the ST and MT in CaFeAsH is intermediate in character, between the second-order transition for 1111-type compounds and the first-order transition for other 11- and 122-type compounds.
机译：通过考虑其温度诱导的相变的性质，可以将铁基超导体分为两种类型的母体化合物;即，对于1111型化合物的122-和11型化合物和二阶转变的一级转变。这项工作通过特定的热，X射线衍射，中子衍射和电阻率测量检查CafeSh的结构和磁性过渡（ST和MT）。热容量测量揭示了在96K处伴随着表观单峰的二阶相转变。然而，检测到从四边形到正晶相的清除ST和从顺磁相到反铁磁相的MT。结构（T-S）和NEER温度（T-N）分别通过X射线和中子衍射和电阻率测量测定为95（2）和96k。这种小的温差T-S-T-N归因于由于在母细胞1111型铁砷中具有最短晶格常数C的CAFEASH的层间方向上的强磁耦合。考虑到在具有短间距离的11和122型化合物中进行一阶转变，我们得出结论，CafeSeSh中的ST和MT的性质是中间的，在1111的二阶转换之间 - 其他11-和122型化合物的型化合物和一阶转变。

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    Muraba Yoshinori; Iimura Soshi; Matsuishi Satoru; Hiramatsu Hidenori; Honda Takashi; Ikeda Kazutaka; Otomo Toshiya; Hosono Hideo;

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    Tokyo Inst Technol Mat Res Ctr Element Strategy Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268503 Japan;

    Tokyo Inst Technol Lab Mat &

    Struct 4259 Nagatsuta Cho Yokohama Kanagawa 2268503 Japan;

    Tokyo Inst Technol Mat Res Ctr Element Strategy Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268503 Japan;

    Tokyo Inst Technol Mat Res Ctr Element Strategy Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268503 Japan;

    High Energy Accelerator Res Org KEK Inst Mat Struct Sci Tsukuba Ibaraki 3050801 Japan;

    High Energy Accelerator Res Org KEK Inst Mat Struct Sci Tsukuba Ibaraki 3050801 Japan;

    High Energy Accelerator Res Org KEK Inst Mat Struct Sci Tsukuba Ibaraki 3050801 Japan;

    Tokyo Inst Technol Mat Res Ctr Element Strategy Midori Ku 4259 Nagatsuta Cho Yokohama Kanagawa 2268503 Japan;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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