Andreev A V, Yoshii S, Kuz'min M D, de Boer F R, Kindo K, Hagiwara M
Joint Laboratory for Magnetic Studies, Institute of Physics, Academy of Sciences, Na Slovance 2, 18221 Prague 8, Czech Republic. Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 12116 Prague 2, Czech Republic.
J Phys Condens Matter. 2009 Apr 8;21(14):146005. doi: 10.1088/0953-8984/21/14/146005. Epub 2009 Mar 13.
Magnetization study of a single crystal of Nd(2)Fe(14)Si(3) (with the rhombohedral Th(2)Zn(17)-type structure) reveals that the compound is a ferromagnet with a spontaneous magnetic moment of 32.3μ(B) per formula unit (at T = 2 K) and a Curie temperature equal to 495 K. The easy-magnetization direction lies close to the b-axis, tilting slightly towards the c-axis. (The b-axis [120] is not a high-symmetry direction in the crystallographic class D(3d).) The observed strong magnetic anisotropy is attributed almost entirely to the Nd sublattice, as concluded from comparison with a Y(2)Fe(14)Si(3) single crystal. A magnetic field applied along the c-axis induces a first-order spin reorientation transition at B(FOMP) = 20 T. In the process of magnetization the Nd and Fe sublattices behave as essentially non-collinear. This is manifest particularly in the downward curvature of the first (pre-FOMP) stage of the magnetization curve. It is proposed to regard this curvature as a validity criterion for the single-sublattice approximation.
对具有菱面体Th₂Zn₁₇型结构的Nd₂Fe₁₄Si₃单晶进行的磁化研究表明，该化合物是一种铁磁体，每个化学式单元的自发磁矩为32.3μ(B)（在T = 2 K时），居里温度为495 K。易磁化方向靠近b轴，略微向c轴倾斜。（b轴[120]在晶体学类D₃d中不是高对称方向。）从与Y₂Fe₁₄Si₃单晶的比较得出，观察到的强磁各向异性几乎完全归因于Nd亚晶格。沿c轴施加的磁场在B(FOMP) = 20 T时诱导一阶自旋重取向转变。在磁化过程中，Nd和Fe亚晶格的行为基本上是非共线的。这在磁化曲线的第一个（预FOMP）阶段的向下曲率中尤为明显。建议将这种曲率视为单亚晶格近似的有效性标准。
