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Suppression of the bulk high spin-low spin transition by doping the chiral magnet MnGe

机译:通过掺杂手性磁体MnGe来抑制整体高自旋-低自旋跃迁

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摘要

In the MnGe chiral magnet, the helimagnetic order and local moment collapse in two steps, showing the succession of high spin (HS) and low spin (LS) states as pressure increases. Here, we use high-pressure neutron diffraction to study the doped compounds Mn0.86Co0.14Ge and Mn0.9Rh0.1Ge, and show that the evolution of their microscopic magnetic properties is instead continuous. It means that the bulk HS-LS transition is a unique feature of pure MnGe, very sensitive to small changes of the band structure and easily suppressed by chemical substitution. On the other hand, the helimagnetic correlations appear to be strengthened by doping and survive up to larger pressures (approximate to 19 GPa, to be compared with approximate to 13 GPa). We discuss these results in the light of other disordered systems with remarkable properties, the so-called Invar alloys.
机译:在MnGe手性磁体中,磁顺次序和局部力矩分两步崩溃,显示出随着压力的增加,高自旋(HS)和低自旋(LS)的状态连续变化。在这里,我们使用高压中子衍射来研究掺杂的化合物Mn0.86Co0.14Ge和Mn0.9Rh0.1Ge,并表明它们微观磁性能的演化是连续的。这意味着大量的HS-LS跃迁是纯MnGe的独特特征,对能带结构的微小变化非常敏感,并且容易被化学取代抑制。另一方面,通过掺杂可以增强电磁效应,并且可以承受更高的压力(约19 GPa,约13 GPa)。我们将根据具有显着特性的其他无序系统(即所谓的殷钢合金)来讨论这些结果。

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