含杂质和压力的MnSi中出射磁场的大幅增强
Large enhancement of emergent magnetic fields in MnSi with impurities and pressure
摘要：
本文报道了在高压下掺Fe的MnSi中的拓扑霍尔效应的研究结果，并与纯MnSi的结果进行了比较。我们发现，Fe掺杂增加了THE，表明增强的紧急规范场的大小。这是一致的，在skyrmion晶格的长度尺度的并发减少。对于加压和掺杂的样品，我们计算出的紧急磁场的大小的基础上测量的THE，并将其与理论上限。我们发现，这两个比例保持或多或少的恒定与压力或Fe掺杂，但在大气压下，从纯MnSi的差异很大。我们讨论了这一比例的影响，饱和磁矩和螺距长度的趋势T_C \rightarrow 0通过掺杂和压力，分别。
英文摘要：
We report a study of the topological Hall effect (THE) in Fe-doped MnSi and compare with results from pure MnSi under pressure. We find that Fe doping increases the THE, indicating an enhancement of the magnitude of the emergent gauge field. This is consistent with the concurrent reduction in the length scale of the skyrmion lattice. For both pressurized and doped samples, we calculate the emergent magnetic field based on the size of the measured THE, and compare it with a theoretical upper-bound. We find that the ratio of these two remains more or less constant with pressure or Fe doping, but differs greatly from that of pure MnSi at ambient pressure. We discuss the implications of this ratio with respect to trends in the saturated magnetic moment and helical pitch length as T_C \rightarrow 0 via doping and pressure, respectively.
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