Transition-Metal and Rare-Earth Systems: Magnetism and Structure

提出了磁化矢量测量方法，用于详细研究各种自旋玻璃合金系统（例如铜-锰，金-铁）中的旋转磁性过程，包括相对于无序晶格的各向异性（最初由场冷却产生）的耗散旋转引起的不可变性的开始。用非弹性中子散射实验探讨了钇铜立方相的晶格不稳定性（由高x的Holmium1-xYttriumxCopper的反常四极相互作用表明）。利用高x正交化合物的中子衍射数据，对立方镨-银- xcopperx结构不稳定性的结合势模型进行了测试。一系列镧- xneodymiumxcopper oxid4化合物将跨越四方-正交过渡的组成进行磁研究，以获得A的四极偶联证据晶格的不稳定。磁化、比热和电阻率测量，补充中子衍射功，将在Terbium1-xYttriumxSilver和Gadolinium1-xYttriumxSilver上进行，以研究随x增加的远程反铁磁性的渗透击穿。

Magnetization-vector measurements are proposed for the detailed investigation of rotational magnetic processes in various spin- glass alloy systems (e.g. Copper-Manganese, Gold-Iron), including the onset of irreversibility arising from dissipative rotations of the anisotropy (initially produced by field-cooling) relative to the disordered crystal lattice. The lattice instability of the cubic phase of Yttrium-Copper (indicated by anomalous quadrupolar interactions in Holmium1-xYttriumxCopper of high x) will be probed by inelastic neutron scattering experiments. A binding-potential model for the structural instability of cubic Praseodymium-Silver1-xCopperx will be tested against neutron diffraction data on the orthorhombic compounds of high x. A series of Lanthanum2-xNeodymiumxCopper Oxide4 compounds spanning the composition for the tetragonal-orthorhombic transition will be studied magnetically for quadrupolar-coupling evidence of a lattice instability. Magnetization, specific heat, and resistivity measurements, supplemented by neutron diffraction work, will be performed on Terbium1-xYttriumxSilver and Gadolinium1-xYttriumxSilver in a study of the percolation- breakdown of the long-range antiferromagnetism with increasing x.