Conical-to-ferromagnetic phase conversion induced by cation order?disorder transition in Hf1?xTixMnSb2
Conical-to-ferromagnetic phase conversion induced by cation order?disorder transition in Hf1?xTixMnSb2
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Hf1?xTixMnSb2 中阳离子有序无序转变引起的圆锥形铁磁相变
DOI：
10.1016/j.jssc.2018.04.027
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
*H. Kageyama
中科院分区：
文献类型：
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作者：
T. Murakami;T. Yamamoto;A. Kumar;S. M. Yusuf;*H. Kageyama
研究了NiAs结构固溶体Hf1–xTixMnSb2(0≤x≤1)中金属有序无序与磁性能的关系。同步加速器X射线衍射研究表明，HfMnSb2中的二维（2D）金属有序结构在x=0.15时仍然存在，尽管其金属有序度随着x的增加而降低。虽然当0.2≤x≤0.3时不形成类NiAs相，但当x≥0.4时出现金属无序相。圆锥形自旋有序仅在金属有序区域中发现，并且对部分阳离子无序相当稳健，而完全金属无序区域是铁磁态，这提供了金属有序的存在/不存在本质上定义基态的有力证据。 HfMnSb2 的中子去极化测量表明可能存在连续相变。
The relation between metal order-disorder and magnetic properties in the solid solution Hf1–xTixMnSb2(0 ≤x≤ 1) with the NiAs structure is investigated. The synchrotron X-ray diffraction studies have revealed that two-dimensional (2D) metal-ordered structure in HfMnSb2persists up tox= 0.15, though its degree of metal order decreases withx. Although the NiAs-like phase is not formed for 0.2 ≤x≤ 0.3, a metal disordered phase appears forx≥ 0.4. A conical spin order is only found in the metal-ordered region and is fairly robust against partial cation disorder, while the completely metal-disordered region is a ferromagnetic state, providing firm evidence that the presence/absence of metal order essentially defines the ground state. Neutron depolarization measurement for HfMnSb2suggests possible successive phase transitions.