Interaction between spin, lattice, and charge in non-centro\-symmetric correlated metals

这次更新提出了精心挑选的非中心对称材料的光散射实验，以澄清复杂的磁序存在下的载流子动力学。这将完成并扩展在实施几项关键技术创新后在第一个资助期内成功完成的MnSi工作。在MnSi的声子被证明是提供相关的信息上的过渡到磁有序相和波动为主的范围以上的居里温度。对称性相关的电子动力学与费米面的不同片。在磁有序状态下的弛豫速率发现在拉曼实验表现出显着不同的温度依赖性从运输预期。我们推测，电子散射从复杂的自旋纹理，如螺旋或skyrmions;然而，相对于纵向或横向运输，这没有理论基础。更新的目标之一是澄清有关具有复杂自旋顺序的材料（如MnSi）中奇异激发作用的问题。为此，我们计划在MnSi上进行施加静水压力和磁场的实验。利用手头的设备，我们最好准备访问1.46GPa以上的量子无序相。在这里，电阻率随T^{3/2}变化，这与在螺旋磁相中观察到的T^2费米液体行为有很大的偏差。在施加约1 GPa的压力下，Skyrmion或A相在相图中具有最大的延伸，并且对拓扑霍尔效应的影响最强。因此，在拉曼光谱中，我们期望观察到使我们能够推导出相关的动量相关的载流子特性的特征。我们打算通过对Mn0.92Fe0.08Si和Mn0.96Co0.04Si的实验来研究这些基本性质和推定功能之间的相互关系。最后，设想将工作从d-电子系统扩展到f-电子系统，例如CePt 3Si、CeIrSi 3和CeTA 1 3（T=Cu、Ag、Au、Pd、Pt），其具有紧密接近的铁磁、反铁磁和超导相。在第一个供资期内，所有材料类别的相图都可以通过组装的独特设备获取。在与我们的合作伙伴密切合作，我们计划使用互补的实验方法深入研究的基本激发。同时理论分析的目的是确定最相关的载体动力学的相互作用。

This renewal proposes light scattering experiments on carefully selected non-centrosymmetric materials to clarify carrier dynamics in the presence of complex magnetic order. This will complete and extend the work on MnSi that was successfully performed during the first funding period after implementing several crucial technical innovations. In MnSi the phonons were shown to provide relevant information on the transition into the magnetically ordered phase and the fluctuation-dominated range above the Curie temperature. Symmetry-dependent electron dynamics were associated with different sheets of the Fermi surface. In the magnetically ordered state the relaxation rates found in the Raman experiments exhibited a temperature dependence significantly different from that expected from transport. We speculate that the the electrons scatter from complex spin textures such as helices or skyrmions; yet, as opposed to longitudinal or transverse transport, this has no theoretical foundation. It is one of the objectives of the renewal to clarify questions about the role of exotic excitations in materials with complex spin order such as MnSi. To this end we plan experiments on MnSi with applied hydrostatic pressure and field. With the equipment at hand we are optimally prepared to access the quantum disordered phase above 1.46GPa. Here the resistivity varies as T^{3/2}, a significant deviation from the T^2 Fermi liquid-like behavior observed in the helimagnetic phase. With an applied pressure of approximately 1 GPa the skyrmion or A-phase has the largest extension in the phase diagram and the strongest impact on the topological Hall effect. In the Raman spectra we thus expect to observe signatures enabling us to derive related momentum dependent carrier properties. We intend to study the interrelation between these fundamental basic properties and putative functionalities via experiments on Mn0.92Fe0.08Si and Mn0.96Co0.04Si. Finally, it is envisaged to extend the work from d- to f-electron systems such as CePt3Si, CeIrSi3, and CeTAl3 (T=Cu, Ag, Au, Pd, Pt) having ferromagnetic, antiferromagnetic, and superconducting phases in close proximity. In all material classes the respective phase diagrams will be accessible with the unique equipment assembled during the first funding period. In close collaboration with our partners we plan in-depth studies of the elementary excitations using complementary experimental methods. Simultaneous theoretical analysis is intended to identify the interactions which are most relevant for the carrier dynamics.