Magnetic transition temperatures follow crystallographic symmetry in samarium under high-pressures and low-temperatures

Magnetic transition temperatures follow crystallographic symmetry in samarium under high-pressures and low-temperatures
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在高压和低温下,钐的磁转变温度遵循晶体学对称性

DOI:
10.1088/1361-648x/29/6/065801
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发表时间:
2017
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Vohra, Yogesh K
Vohra, Yogesh K
中科院分区:
--
文献类型:
--
作者:
Johnson, Craig R;Tsoi, Georgiy M;Vohra, Yogesh K

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利用超灵敏的电输运测量技术,研究了稀土金属钐(Sm)在高压至47gpa、低温至10k条件下的磁有序温度。α-Sm相在106 K和14 K处的两个磁跃迁分别归因于六方层和立方层上的反铁磁有序,当Sm处于双六方紧密堆积(dhcp)相时,在10 GPa附近坍缩为一个磁跃迁。当压力进一步增加到34 GPa以上时,磁性转变再次分裂,Sm采用六角形- hp3结构,表明不同晶体位置的磁性转变温度不同。基于实验数据,提出了钐中六角形- hp3相的磁有序模型。α-Sm→dhcp→fcc/dist过程的磁转变温度与晶体对称性密切相关。高压低温下fcc→hP3结构序列。
Magnetic ordering temperatures in rare earth metal samarium (Sm) have been studied using an ultrasensitive electrical transport measurement technique in a designer diamond anvil cell to high-pressure up to 47 GPa and low-temperature to 10 K. The two magnetic transitions at 106 K and 14 K in the α-Sm phase, attributed to antiferromagnetic ordering on hexagonal and cubic layers respectively, collapse in to one magnetic transition near 10 GPa when Sm assumes a double hexagonal close packed (dhcp) phase. On further increase in pressure above 34 GPa, the magnetic transitions split again as Sm adopts a hexagonal-hP3 structure indicating different magnetic transition temperatures for different crystallographic sites. A model for magnetic ordering for the hexagonal-hP3 phase in samarium has been proposed based on the experimental data. The magnetic transition temperatures closely follow the crystallographic symmetry during α-Sm→ dhcp→ fcc/dist. fcc→ hP3 structure sequence at high-pressures and low-temperatures.
DOI: --
发表时间: 1978
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