Structural and magnetic characterization of Mn3IrGe and Mn3Ir(Si1−xGex): experiments and theory
Structural and magnetic characterization of Mn3IrGe and Mn3Ir(Si1−xGex): experiments and theory
复制标题
Mn3IrGe 和 Mn3Ir(Si1−xGex) 的结构和磁性表征：实验和理论
DOI：
10.1016/j.jssc.2004.07.001
复制
发表时间：
2004
影响因子：
3.3
通讯作者：
Y. Andersson
中科院分区：
文献类型：
--
作者：
T. Eriksson;L. Bergqvist;P. Nordblad;O. Eriksson;Y. Andersson
利用X射线和中子粉末衍射、磁化强度测量和第一性原理计算研究了Ir-Mn-Ge三元新相Mn 3 IrGe和固溶体Mn 3 Ir（Si 1 −xGex）0 <$x <$1的结构和磁性。晶体结构为立方晶系，属AlAu 4型（β-Mn结构的有序形式），Z=4，空间群P213，晶胞尺寸随硅含量线性变化。对于所有的组合物，反铁磁有序被发现低于约225 K的临界温度。磁结构是非共线的，这是由于锰原子三角形网络上的受抑磁相互作用的结果，其磁矩围绕三角形轴旋转120°。Mn_3 IrGe在10 K时的磁矩为3.39（4）μ B。理论计算以很好的精度再现了实验观察到的磁矩的大小和方向。
The structural and magnetic properties of a new ternary Ir–Mn–Ge phase, Mn3IrGe, as well as the solid solution Mn3Ir(Si1−xGex), 0⩽x⩽1, have been investigated by means of X-ray and neutron powder diffraction, magnetization measurements and first principles calculations. The crystal structure is cubic, of the AlAu4-type (an ordered form of the β-Mn structure), Z=4, space group P213, and the unit-cell dimension varies linearly with the silicon content. For all compositions, antiferromagnetic ordering is found below a critical temperature of about 225K. The magnetic structure is noncollinear, as a result of frustrated magnetic interactions on a triangular network of Mn atoms, on which the moments rotate 120° around the triangle axes. The magnitude of the magnetic moment at 10K is 3.39(4)μBfor Mn3IrGe. The theoretical calculations reproduce with very good accuracy the magnitudes as well as the directions of the experimentally observed magnetic moments.