High pressure neutron diffraction study of magnetic ordering in erbium

High pressure neutron diffraction study of magnetic ordering in erbium
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铒磁有序的高压中子衍射研究

DOI:
10.1016/j.jmmm.2024.172066
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发表时间:
2024
影响因子:
2.7
通讯作者:
Vohra, Yogesh K.
Vohra, Yogesh K.
中科院分区:
材料科学3区
文献类型:
--
作者:
Clay, Matthew P.;Sereika, Raimundas;Higgins, Maurissa K.;dos Santos, Antonio M.;Molaison, Jamie J.;Vohra, Yogesh K.

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我们在美国橡树岭国家实验室的中子源上用中子衍射技术研究了多晶铒在高达32 GPa的高压和低至10 K的低温下的磁有序。对于六方密堆积(hcp)相,强的核和磁卫星强度允许同时细化的核和磁结构。在1 GPa的外加压力下,c轴调制相和摆线相的调制矢量q= γ c ε,γ ε 2/7与先前在低压下的单晶研究一致。在6.7 GPa的hcp相中,我们发现γ = 0.31,表明磁结构相对于晶格的周期减小。在6.7GPa下的磁有序温度略高于60 K。在32 GPa下,双六方密排相的磁散射将磁有序温度限制在25±5 K。我们的中子衍射研究表明,磁有序持续在高压双六方密堆积相铒的最高压力为32 GPa。
We have studied magnetic ordering in polycrystalline erbium at high pressures up to 32 GPa and low temperatures down to 10 K using neutron diffraction techniques at the Spallation Neutron Source at Oak Ridge National Laboratory, USA. For the hexagonal close-packed (hcp) phase, strong nuclear and magnetic satellite intensities permit a simultaneous refinement of the nuclear and magnetic structures. At 1 GPa of applied pressure, a modulation vector q= γ c∗ with γ≈ 2/7 for the c-axis modulated and cycloidal phases is consistent with prior single-crystal studies at low pressures. At 6.7 GPa in the hcp phase, we find γ≈ 0.31, indicating a reduction in the period of the magnetic structure with respect to the crystal lattice. The magnetic ordering temperature at 6.7 GPa is slightly above 60 K. At 32 GPa in the double hexagonal close-packed phase, the magnetic scattering constrains the magnetic ordering temperature to 25±5 K. Our neutron diffraction study demonstrates that the magnetic ordering persists in the high-pressure double hexagonal close-packed phase of erbium to the highest pressure of 32 GPa.
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