Characteristic metamagnetic transitions in NpRhGa5 and UPtGa5

Characteristic metamagnetic transitions in NpRhGa5 and UPtGa5
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NpRhGa5 和 UPtGa5 中的特征变磁转变

DOI:
10.1088/1742-6596/51/1/051
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发表时间:
2006
期刊:
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影响因子:
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通讯作者:
Y. Ōnuki
Y. Ōnuki
中科院分区:
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文献类型:
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作者:
K. Sugiyama;H. Nakashimaa;T. Yamada;D. Aoki;S. Ikeda;Y. Haga;E. Yamamoto;A. Nakamura;Y. Homma;Y. Shiokawa;K. Kindo;M. Hagiwara;Y. Ōnuki

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我们测量了高达 55 T 的高场磁化强度,并构建了具有四方结构的超铀反铁磁体 NpRhGa5 的磁相图。易磁化轴 H//[100] 在 4.2 K 处的磁化强度表明在 Hc = 26 T 处有急剧阶跃的变磁转变,并在 Hs = 38 T 以上饱和,在 Hs 处达到 0.43 μB/Np。另一方面,对于难轴 H//[001],磁化强度在 Hs = 28 T 处饱和,在 Hs 处达到 0.44 μB/Np。磁化强度表明,作为磁场的函数,磁矩从零磁场下的 0.96 μB/Np 减少到饱和磁场下的 0.44 μB/Np。 NpRhGa5 中的这些实验结果与具有相似反铁磁结构的 UPtGa5 中的简单磁性进行了比较。
We measured the high-field magnetization up to 55 T and constructed a magnetic phase diagram for a transuranium antiferromagnet NpRhGa5 with the tetragonal structure. The magnetization at 4.2 K for an easy-axis H//[100] indicates a metamagnetic transition with a sharp step at Hc = 26 T and saturates above Hs = 38 T, reaching 0.43 μB/Np at Hs. On the other hand, the magnetization saturates at Hs = 28 T for a hard-axis H//[001], reaching 0.44 μB/Np at Hs. The magnetization indicated that the magnetic moment reduces from 0.96 μB/Np at zero field to 0.44 μB/Np at the saturation field as a function of magnetic field. These experimental results in NpRhGa5 are compared with the simple magnetism in UPtGa5with the similar antiferromagnetic structure.