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首页> 外文期刊>Physical review >Antiferromagnetic ordering in a mixed-valent cerium compound CeRuSn
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Antiferromagnetic ordering in a mixed-valent cerium compound CeRuSn

机译：混合铈化合物CeRuSn中的反铁磁有序

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摘要

We report the results of extensive neutron powder diffraction experiments on a ternary compound CeRuSn in a temperature range from 2 to 520 K. At room temperature CeRuSn orders in a monoclinic structure that is related to the CeCoAl type by the doubling of the c-axis parameter caused by the splitting of the original single sites for each element into two sites. Upon cooling a very broad hysteretic structural transition has been observed in CeRuSn leading to the presence of higher-ordered variants having multiple c-axis parameters. Depending on the temperatures, one or the other variant seems to be more stable, but the sample as a whole becomes multiphase. We find also evidence for further symmetry lowering at low temperatures. CeRuSn is found to exhibit an antiferromagnetic order below T_N = 2.8(1) K. The order is described by two incommensurate propagation vectors q_1 = (0,0,≈0.30) and q_2 = (0,0, ≈0.43) with respect to the doubled crystal structure variant. Although the details of the magnetic structure remain elusive, the best agreement has been found for a complicated distorted cycloidal magnetic structure with Ce moments of ≈0.7 μB being confined to the ac plane.
机译：我们报告了在2至520 K的温度范围内对三元化合物CeRuSn进行的大量中子粉末衍射实验的结果。在室温下，CeRuSn在单斜晶结构中的阶数与cCoAl类型有关，c轴参数加倍这是由于将每个元素的原始单个站点拆分为两个站点而引起的。冷却后，在CeRuSn中观察到非常宽的滞后结构转变，导致存在具有多个c轴参数的高阶变体。根据温度，一个或另一个变体似乎更稳定，但样品整体上变成多相的。我们还发现低温下对称性进一步降低的证据。发现CeRuSn在T_N = 2.8（1）K以下表现出反铁磁顺序。该顺序由两个不相称的传播矢量q_1 =（0,0，≈0.30）和q_2 =（0,0，≈0.43）来描述晶体结构翻倍。尽管磁性结构的细节仍然难以捉摸，但是对于复杂的扭曲摆线磁性结构，将≈0.7μB的Ce矩限制在ac平面中，已经找到了最佳的协议。

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