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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 >Competition between ferromagnetic and antiferromagnetic exchange interactions in the quasibinary U(Ge_(1-x)Sn_x)_2 compounds
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Competition between ferromagnetic and antiferromagnetic exchange interactions in the quasibinary U(Ge_(1-x)Sn_x)_2 compounds

机译：准二元U（Ge_（1-x）Sn_x）_2化合物中铁磁和反铁磁交换相互作用之间的竞争

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摘要

The evolution of the magnetic ordering temperature T_M and the low-temperature magnetic structure in the quasibinary compounds U(Ge_(1-x)Sn_x)_2 for 0.01 <= x <= 1 were studied by means of ~(119)Sn Mossbauer spectroscopy. These compounds are solid solutions between the ferromagnet Uge_2 (T_C = 52 K) and the antiferromagnet Usn_2 (T_N = 75 K), both being collinear. The boundary compounds possess different easy-magnetization directions, the aand c-axis, respectively. The minimum ordering temperature (T_(min) approx= 36 K) has been found for x = 0.58. The complex Mossbauer spectra observed for lower Sn concentrations could be attributed to the appearance of two non-collinear spin configurations characterized by a canting angle between pairs of U magnetic moments of 60 and 120 deg, respectively. When increasing the Sn concentration beyond x = 0.58, the Mossbauer spectrum resembles that observed for Usn_2 which is accompanied by a rapid increase of T_M.
机译：通过〜（119）Sn Mossbauer光谱研究了准二元化合物U（Ge_（1-x）Sn_x）_2在0.01 <= x <= 1中的磁性有序温度T_M和低温磁性结构的演化。这些化合物是铁磁体Uge_2（T_C = 52 K）和反铁磁体Usn_2（T_N = 75 K）之间的固溶体，它们都是共线的。边界化合物分别具有不同的易磁化方向，即a轴和c轴。对于x = 0.58，已找到最低订购温度（T_（min）大约= 36 K）。在较低的Sn浓度下观察到的复杂的Mossbauer光谱可归因于两种非共线自旋结构的出现，其特征是分别在60和120度的U磁矩对之间的倾斜角。当Sn浓度增加到超过x = 0.58时，Mossbauer光谱类似于Usn_2观察到的光谱，伴随着T_M的快速增加。

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