标题： 混合B20立方螺旋磁体中长程和短程螺旋序之间的转变 显示英文标题

标题： Transition between long and short-range helical orders in mixed B20 cubic helimagnets

摘要： 考虑了一个具有强(挫折)缺陷键的B20螺旋磁体模型。 单个缺陷提供了类似偶极场的螺旋磁序畸变。 在有限的缺陷键浓度下，螺旋矢量在其在纯系统中的值上获得修正。 此外，表明足够但较小浓度的强缺陷能够破坏长程有序，将系统驱动到具有短程螺旋有序的相。 认为所发展的方法允许描述Mn$_{1-x}$Fe$_x$Si和Mn$_{1-x}$Co$_x$Si化合物中的主要实验观测结果。 显示英文摘要

摘要： A model of B20 helimagnet with strong (frustrating) defect bonds is considered. Single defect provides dipolar field-like distortion of the helical magnetic ordering. At finite defect bond concentrations, the spiral vector acquires correction to its value in the pure system. Moreover, it is shown that the strong defects of sufficient but small concentration are able to destroy long-range order driving the system to the phase with short-range helical ordering. It is argued that the developed approach allows describing main experimental observations in Mn$_{1-x}$Fe$_x$Si and Mn$_{1-x}$Co$_x$Si compounds.