标题： 场诱导转变的性质和非共线反铁磁体EuIn2As2中的滞回磁电阻 显示英文标题

标题： Nature of field-induced transitions and hysteretic magnetoresistance in non-collinear antiferromagnet EuIn2As2

摘要： 我们研究了六方EuIn2As2化合物的磁性和电输运性质，结合了实验和理论结果。从电子角度来看，该化合物被预测为轴子绝缘体，在共线磁相中则为交替磁体。然而，实验表明费米能级位于价带内而非拓扑间隙中，可能导致磁性性质占主导地位。我们对磁化和电输运的详细研究支持了之前通过X射线和中子衍射实验识别出的螺旋反铁磁态的存在。值得注意的是，在该状态下，我们观察到一种场诱导的巨磁阻转变，其特征是磁阻中有大的滞后效应，当磁场相对于晶体c轴倾斜15度时，该转变变为尖锐的上升。结合理论计算，解释为施加磁场改变了低电阻反铁磁畴壁为高电阻畴壁，这是由于畴壁中费米面片相互作用面积的减少所致，这种减少源于As的p轨道。因此，EuIn2As2提供了一个新的案例研究，拓宽了对复杂磁结构及其对电输运影响的理解。 显示英文摘要

摘要： We examine the magnetic and electrical transport properties of the hexagonal EuIn2As2 compound, combining experimental and theoretical results. This compound is predicted to be an axion-insulator from an electronic point of view and an altermagnet while in the collinear magnetic phase. However, experiments indicate that the Fermi level lies within the valence band rather than in the topological gap, potentially leading to the dominance of magnetic properties. Our detailed studies on magnetization and electrical transport support the presence of a broken-helix antiferromagnetic state, which was previously identified by X-ray and neutron diffraction experiments. Notably, we observed within that state a field-induced metamagnetic transition marked by a large hysteresis in magnetoresistance, which turns into a sharp upturn for the magnetic field tilted by 15 degree from the c-axis of the crystal. Combined with theoretical calculations, it is explained that the application of a magnetic field changes the low-resistivity antiferromagnetic domain walls to the high-resistivity domain walls due to the reduction in the Fermi surface sheets interaction area in the domain walls, originating from p-orbitals of As. EuIn2As2, therefore, presents a new case study that broadens the understanding of complex magnetic structures and their influence on electrical transport.