论文标题
在Fe掺杂的MNNIGE合金中外部压力下螺旋磁结构的鲁棒性
Robustness of helical magnetic structure under external pressure in Fe-doped MnNiGe alloy
论文作者
论文摘要
我们已经研究了名义组成的Fe掺杂MNNIGE合金MNNI $ _ {0.75} $ fe $ _ {0.25} $ ge的详细磁性结构。合金在230 K和275 K之间进行马氏体相变。低温的马氏体相阶在MN旋转的螺旋调制中抗fiferromagnet。在1.5 k时，发现不相称的繁殖矢量$ \ bf k $为（0.1790（1），0,0），并且在环境条件下的温度几乎保持不变。外部压力（$ p $）的施加可降低马氏体过渡温度，并导致不稳定的磁传播载体发生重大变化。在10 K时，具有6 kbar的外部压力，合金的不稳定磁性结构以$ \ bf k $ =（0.1569（1），0,0）稳定。有趣的是，还观察到在外部$ p $存在下$ \ bf k $的强度依赖性。
We have investigated the detailed magnetic structure of a Fe-doped MnNiGe alloy of nominal composition MnNi$_{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.
