Spherical neutron polarimetry under high pressure for a multiferroic delafossite ferrite.
Spherical neutron polarimetry under high pressure for a multiferroic delafossite ferrite.
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DOI：
10.1038/s41467-018-06737-6
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发表时间：
2018-10-22
影响因子：
16.6
通讯作者：
Osakabe T
中科院分区：
文献类型：
--
作者：
Terada N;Qureshi N;Chapon LC;Osakabe T
三维中子自旋极化矢量的分析，使用被称为球形中子极化（SNP）的技术，是确定磁性材料中复杂磁性结构的非常强大的手段。然而，需要保持中子处于高度极化状态，这使得很难在极端的实验条件下使用这种技术。我们研制了一种完全由超导材料制成的对中子极化无影响的高压池。在这里，我们报告的第一个SNP分析高压下高达4.0 GPa的磁电多铁性铜铁矿CuFeO2。这项研究还确定了复杂的螺旋磁结构，在这些压力引起的阶段，通过测量全中子极化矩阵。本文给出的结果表明，SNP测量在高压条件下是可行的，并且该方法是研究压力引起的物理现象的有用方法。高压条件下的球形中子极化实验面临着许多实验难题。本文报道了SNP对顶混合高压电池的研制及其在铜铁矿CuFeO_2磁电多铁性体系中的应用。
The analysis of three-dimensional neutron spin polarization vectors, using a technique referred to as spherical neutron polarimetry (SNP), is a very powerful means of determining complex magnetic structures in magnetic materials. However, the requirement to maintain neutrons in a highly polarized state has made it difficult to use this technique in conjunction with extreme experimental conditions. We have developed a high pressure cell made completely of nonmagnetic materials and having no effect on neutron polarizations. Herein, we report the first SNP analyses under high pressure up to 4.0 GPa in the magnetoelectric multiferroic delafossite CuFeO2. This study also determined the complex spiral magnetic structures in these pressure-induced phases, by measuring the full neutron polarization matrix. The results presented herein demonstrate that the SNP measurements are feasible under high pressure conditions, and that this method is a useful approach to study pressure-induced physical phenomena. Spherical neutron polarimetry (SNP) experiment in conjunction with high pressure condition faces many experimental difficulties. Here the authors report development of SNP with nonmagnetic hybrid anvil high pressure cell and application to the magnetoelectric multiferroic delafossite CuFeO2 system.
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