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首页> 外文期刊>Materials transactions >Magnetic Phase Transitions and Lattice Changes in Rare Earth Metals Studied by X-ray Diffraction under a Magnetic Field
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Magnetic Phase Transitions and Lattice Changes in Rare Earth Metals Studied by X-ray Diffraction under a Magnetic Field

机译：磁场作用下X射线衍射研究稀土金属的磁性相变和晶格变化

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The lattice change of the rare earth metals Dy, Ho and Er has been studied by x-ray diffraction under a magnetic field in the c-plane of a hexagonal crystal. Continuous and discontinuous changes of the c-lattice parameter accompanying magnetic phase transitions have been observed in these metals, and satellite reflections caused by the lattice modulation have been found in the distorted helix and helifan phases of Ho and the distorted helix phase of Dy. In Er, the 2nd- and 4th-order satellites appeared below 4.5 T at 35 K, and the 6th-order satellite has been observed above 4.5 T in addition to the 2nd- and 4th-order satellites. These results can be explained with the magnetoelastic effect and the magnetic structure calculated by the self-consistent mean field method, except for the result for Er above 4.5 T at 35 K, where a strongly distorted fan magnetic structure should be assumed to explain the presence of the 6th-order satellite of the lattice modulation.
机译：稀土金属Dy，Ho和Er的晶格变化已通过在六方晶体c平面中的磁场下通过X射线衍射进行了研究。在这些金属中观察到伴随着磁性相变的c晶格参数的连续和不连续变化，并且在Ho的扭曲螺旋和hefanfan相以及Dy的扭曲螺旋相中发现了由晶格调制引起的卫星反射。在Er中，二阶和四阶卫星在35 K时出现在4.5 T以下，并且在二阶和四阶卫星之外还观测到4.5 T以上的六阶卫星。这些结果可以用磁弹性效应和通过自洽平均场法计算出的磁性结构来解释，但在35 K时Er大于4.5 T的结果除外，在这种情况下，应假定存在严重变形的扇形磁性结构来解释这种存在。点阵调制的六阶卫星的信号。

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