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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Sample quality and the magnetic phase transitions in Nd_3Pd_(20)Ge_6:a
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Sample quality and the magnetic phase transitions in Nd_3Pd_(20)Ge_6:a

机译：Nd_3Pd_（20）Ge_6：a中的样品质量和磁相变

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摘要

For the cubic intermetallic compound Nd_3Pd_(20)Ge_6 (space group Fm3m) magnetic and transport properties are known to be highly sensitive to sample quality. We have performed powder neutron diffraction experiments down to 100 mK to study the magnetic structures of an inhomogeneous Nd_3Pd_(20)Ge_6 sample, which is the only known 3-20-6 system with three successive magnetic phase transitions. The onset of magnetic Nd order at the 8c site (simple cubic sublattice) is observed in two phase transitions with a dominant commensurate antiferromagnetic component (k_1 = [1,1,1] below T_(N1) = 1.75 K) and an additional weak incommensurate perturbation (k_(1i) = [#tau#,#tau#,#tau#], #tau#=0.79, below T_(Nli) = 1.40 K). The Nd moments at the 4a site (face-centered cubic sublattice) remain disordered down to T_(N2) =0.58 K and align perpendicular to the propagation vector k_2 = [0,0,1]. The phase transition at T_(Nli) appears because of atomic disorder inside the cubic lattice of the 3-20-6 structure. High-quality Nd_3Pd_(20)Ge_6 samples show only two magnetic phase transitions at T_(Nl) and T_(N2).
机译：对于立方金属间化合物Nd_3Pd_（20）Ge_6（空间群Fm3m），磁性和传输性能对样品质量高度敏感。我们已经进行了低至100 mK的粉末中子衍射实验，以研究不均匀Nd_3Pd_（20）Ge_6样品的磁性结构，该样品是唯一已知的具有三个连续磁相变的3-20-6系统。在两个相变中观察到在8c位置（简单立方亚晶格）处的Nd磁性起伏，其中两个主要相称的反铁磁成分（k_1 = [1,1,1]低于T_（N1）= 1.75 K），另外一个弱的不相称的摄动（k_（1i）= [#tau＃，＃tau＃，＃tau＃]，＃tau＃= 0.79，低于T_（Nli）= 1.40 K）。在4a位置（面心立方次晶格）上的Nd矩保持无序直至T_（N2）= 0.58 K，并垂直于传播矢量k_2 = [0,0,1]排列。 T_（Nli）出现相变是因为3-20-6结构的立方晶格内部存在原子无序。高质量的Nd_3Pd_（20）Ge_6样本仅在T_（N1）和T_（N2）处显示两个磁相变。

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