Enhanced electrical magnetochiral effect by spin-hedgehog lattice structural transition
Enhanced electrical magnetochiral effect by spin-hedgehog lattice structural transition
复制标题
自旋刺猬晶格结构转变增强电磁手性效应
DOI：
10.1103/physrevb.103.l220410
复制
发表时间：
2021
影响因子：
3.7
通讯作者：
Tokura Y.
中科院分区：
文献类型：
--
作者：
Kitaori A.;Kanazawa N.;Ishizuka H.;Yokouchi T.;Nagaosa N.;Tokura Y.
非互易电阻取决于电流j和磁场H或磁化强度M的两个方向，通常认为在手性导体中会出现非互易电阻，并且对于j∥H(M)是最大的。根据经验，这种现象，即电磁手性效应(EMChE)，在手性晶格上的顺磁或完全铁磁状态下会增加，或者依赖于日磁状态的涨落性质。本文报道了手性晶格磁体MnGe中宽温度范围内的eMChE，其中自旋刺激型晶格(HL)由三重自旋-螺旋调制矢量形成。在场致HL从立方结构向菱形结构转变的过程中，非互易电阻率的大小急剧增加。这归因于矢量自旋手性增强了电子的不对称散射，并伴随着自旋刺客的大的热涨落。
Nonreciprocal resistance, depending on both directions of current j and magnetic-field H or magnetization M, is generally expected to emerge in a chiral conductor and be maximized for j∥H(M). This phenomenon, electrical magnetochiral effect (eMChE), is empirically known to increase within a paramagnetic or fully ferromagnetic state on chiral lattice or to depend on fluctuation properties of a helimagnetic state. We report here the eMChE over a wide temperature range in the chiral-lattice magnet MnGe in which the spin hedgehog lattice (HL) forms with the triple spin-helix modulation vectors. The magnitude of nonreciprocal resistivity is sharply enhanced in the course of the field-induced structural transition of HL from cubic to rhombohedral form. This is attributed to the enhanced asymmetric electron scatterings by vector spin chirality in association with the large thermal fluctuations of spin hedgehogs.