The structure, specific heat, and magnetic and transport properties of RAlGe (R = Tb and Er) are systematically studied using X-ray diffraction and magnetic and electric measurements. RAlGe crystallizes in an orthorhombic YAlGe-type structure with a space group of Cmcm (N 63, oS12). RAlGe consists of the slanted magnetic isosceles triangles R3Δ-∇R3 and Ge-Al6-Ge and AlGe2-Al-Ge2Al clusters. TbAlGe exhibits two transitions at T_t = 7 K and T_N = 39 K, respectively. ErAlGe orders antiferromagnetically at T_N = 7 K. The magnetic transitions are related to the slanted R3 magnetic isosceles triangles in the (0kl) basal plane. According to the reported magnetic structure of RAlGa, the arrangement of triangular magnetic moments for RAlGe is suggested to be antiparallel along the direction perpendicular to the (0kl) basal plane in the temperature region of T < T_t and along the prism of R3 magnetic isosceles triangle on the (0kl) basal plane before T_N, respectively. The antiferromagnetic order is due to the R3Δ↑ and R3∇↓ exchanging interaction. The magnetic transport of RAlGe depends upon its special magnetic structure, which causes the different magnetic scatters for the conducting electron before and after antiferromagnetic transition and also induces a magnetoresistance ratio change from positive to negative.

中文翻译：

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RAlGe (R = Tb 和 Er) 系统中倾斜磁结构与电磁响应之间的相关性

使用 X 射线衍射和磁电测量系统地研究了 RAlGe（R = Tb 和 Er）的结构、比热、磁和传输特性。RAlGe 以正交 YAlGe 型结构结晶，空间群为Cmcm ( N 63, oS 12)。RAlGe 由倾斜的磁性等腰三角形 R3Δ-∇R3 和 Ge-Al6-Ge 和 AlGe2-Al-Ge2Al 簇组成。TbAlGe 分别在T _t = 7 K 和T _N = 39 K处表现出两个跃迁。ErAlGe 在T _N处具有反铁磁性= 7 K。磁跃迁与 (0kl) 基平面中倾斜的 R3 磁等腰三角形有关。根据已报道的 RAlGa 的磁结构，建议 RAlGe 的三角形磁矩排列在T < T _t温度范围内沿垂直于 (0kl) 基面的方向和沿 R3 磁等腰棱柱反平行T _N之前 (0kl) 基面上的三角形， 分别。反铁磁序是由于 R3Δ↑ 和 R3∇↓ 交换相互作用。RAlGe的磁输运取决于其特殊的磁结构，导致反铁磁跃迁前后导电电子产生不同的磁散射，并引起磁阻比由正变为负。