论文标题
接近Mn $ _ {1-X} $ _ {1-x} $ fe $ _x $ si时，helimagnetic相关性的演变
Evolution of Helimagnetic Correlations when approaching the Quantum Critical Point of Mn$_{1-x}$Fe$_x$Si
论文作者
论文摘要
我们对Mn $ _ {1-x} $ _ {1-x} $ fe $ _x $ si的呼吸磁相关的演变进行了全面研究。通过结合两极分化的中子散射和高分辨率中子自旋回声光谱学，我们研究了三个样品，其中$ x $ = 0.09、0.11和0.14，即浓度$ x^* \ sim 0.11 $的组成，其中helimagnetic bragg peaks and $ x^* $ nish $ x^* $ nish $ x^$ 0.我们发现，在$ x^*$处的远距离螺旋周期性的突然消失不会影响前体波动相关性。这些以与母体化合物MNSI相似的方式以降低的温度降低。而且，动态与MNSI具有很强的相似性。对我们结果的分析表明，挫败感可能是由于Achiral Rkky相互作用而增加的，随着Fe兴奋剂的增加而增加。我们认为，这种效果既解释了前体阶段的扩展，$ x $的增加，也可以解释helimagnetic周期性的突然消失。
We present a comprehensive investigation of the evolution of helimagnetic correlations in Mn$_{1-x}$Fe$_x$Si with increasing doping. By combining polarised neutron scattering and high resolution Neutron Spin Echo spectroscopy we investigate three samples with $x$=0.09, 0.11 and 0.14, i.e. with compositions on both sides of the concentration $x^* \sim 0.11$ where the helimagnetic Bragg peaks disappear and between $x^*$ and the quantum critical concentration $x_C \sim 0.17$, where $T_C$ vanishes. We find that the abrupt disappearance of the long range helical periodicity at $x^*$, does not affect the precursor fluctuating correlations. These build up with decreasing temperature in a similar way as for the parent compound MnSi. Also the dynamics bears strong similarities to MnSi. The analysis of our results indicates that frustration, possibly due to achiral RKKY interactions, increases with increasing Fe doping. We argue that this effect explains both the expansion of the precursor phase with increasing $x$ and the abrupt disappearance of long range helimagnetic periodicity at $x^*$.
