Fe掺杂MnNiGe合金螺旋磁结构的抗外压性能
Robustness of helical magnetic structure under external pressure in Fe-doped MnNiGe alloy
摘要：
我们研究了详细的磁性结构的Fe掺杂的MnNiGe合金的名义组成MnNi $_{0.75}$ Fe $_{0.25}$ Ge的环境和高压（6 kbar）中子粉末衍射研究。合金在230 ~ 275 K之间发生马氏体相变。低温马氏体相反铁磁有序与Mn自旋的螺旋调制。在1.5 K时，无公度传播矢量$\bf k$为（0.1790（1），0，0），在室温下，无公度传播矢量几乎不随温度变化.外加压力（$P$）降低了马氏体相变温度，导致无公度磁传播矢量的显著变化。在10 K，6 kbar的外压下，合金的无公度磁结构稳定为$\bf k$ =（0.1569（1），0，0）。有趣的是，还观察到在外部$P$存在下$\bf k$的强温度依赖性。
英文摘要：
We have investigated the detailed magnetic structure of a Fe-doped MnNiGe alloy of nominal composition MnNi$_{0.75}$Fe$_{0.25}$Ge by ambient and high pressure (6 kbar) neutron powder diffraction study. The alloy undergoes a martensitic phase transition between 230 K and 275 K. The low-temperature martensite phase orders antiferromagnetically with helical modulation of Mn-spins. At 1.5 K, the incommensurate propagation vector $\bf k$ is found to be (0.1790(1),0,0), and it remains almost unchanged with temperature under ambient condition. The Application of external pressure ($P$) reduces the martensitic transition temperature and results in a significant change in the incommensurate magnetic propagation vector. At 10 K, with 6 kbar of external pressure, the incommensurate magnetic structure of the alloy stabilizes with $\bf k$ = (0.1569(1),0,0). Interestingly, the strong temperature dependence of $\bf k$ in the presence of external $P$ has also been observed.
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