Intermetallic compounds containing transition metal layers and chains in the Ae-T-X systems (Ae = alkaline-earth metal; T = Fe, Co, Ni; X = III-V main group element) as candidate materials for new superconductors

铁镍矿/硫系化合物中高温超导电性的发现促使我们将研究扩展到其他含有过渡金属的体系。寻找具有ThCr2Si2型结构的新化合物，以及通过化学取代改变已知的122个含有d-金属层的相，将在这个项目中完成。除了存在于铁镍矿/硫系化合物中的正方形平面d-金属层外，其他平面晶格排列或一维过渡金属原子链的超导性质也应该得到更广泛的研究。三元系Ae-T-X(Ae=碱土金属，T=Fe，Co，Ni，X=Al，Si，Ge，Sb)中极性金属间化合物的合成和详细的结构研究可能导致新的超导类别的发现。样品的制备将采用不同的高温技术(电弧法、感应熔炼法、烧结法)。为了进一步研究磁性和输运性质，合成高纯度的样品和高质量的单晶是我们研究的目标之一。X射线粉末和单晶衍射、扫描电子显微镜和能量色散X射线能谱(SEM/EDX)和热分析将常规用于样品的表征。这些研究将得到基本的电子结构计算的补充。

Discovery of high-temperature superconductivity in iron pnictides/chalcogenides encouraged us to extend our studies to other systems containing transition metals. The search for new compounds with ThCr2Si2-type structure and the alteration of the known 122 phases containing d-metal layers via chemical substitution will be done within this project. Beside the square-planar d-metal layers, which are present in iron-pnictides/chalcogenides, also other planar lattice arrangement or one-dimensional chains of transition metal atoms should be more widely studied with respect to superconducting properties. The syntheses and detailed structural investigations of polar intermetallic compounds in ternary systems Ae-T-X (Ae = alkaline-earth metal, T = Fe, Co, Ni, X = Al, Si, Ge, Sb) could lead to the discovery of new superconducting classes. Preparation of the samples will be done by different high-temperature techniques (arc-melting, induction melting, sintering). The synthesis of high-purity samples and high-quality single crystals for further studies of magnetic and transport properties is one of the goal of our research. X-ray powder and single crystal diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX) and thermal analysis will be routinely used for the sample characterization. These investigations will be supplemented by basic electronic structure calculations.