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

磁化矢量测量被用来详细研究各种自旋玻璃合金系统(如铜-锰、金-铁)中的旋转磁过程，包括各向异性(最初由场冷却产生)相对于无序晶格的耗散旋转所引起的不可逆性。用非弹性中子散射实验研究了Yttrium-Cu3+立方相的晶格不稳定性(由高x的Hl-xYttriumxCu3+中的反常四极相互作用表示)。立方Praseod-Silver1-xCopperx结构不稳定性的结合势模型将用中子衍射数据在高x的正交化合物上进行检验。一系列跨越四方-正交转变组成的La_(2-x)Ne_(2-x)Ne_xCuO_4化合物将被磁学研究，以获得晶格不稳定性的四极耦合证据。在长程反铁磁性随x增加的渗流击穿研究中，将对Tb_(1-x)Y_t_(Triumx)银和Gd_(1-x)Y_t_(？)

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.