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arXiv 2104.06119cond-mat.str-el
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UNi $_4$ $^{11}$ B的晶体学和磁性结构

Crystallographic and magnetic structure of UNi$_4$$^{11}$B

J. Willwater, S. Süllow, M. Reehuis, R. Feyerherm, H. Amitsuka, B. Ouladdiaf, E. Suard, M. Klicpera, M. Vališka, J. Pospíšil, V. Sechovský

摘要:

我们提出了一个广泛的粉末和单晶中子散射调查的晶体结构和磁序的受抑金属$f$ -电子磁体UNi $_4$ B。我们对晶体结构进行了全面的改进,并得出结论,低温晶格对称性是正交的(空间群Pmm 2;晶胞参数:$a = 6.963(4)~Å$,$b = 14.793(9)~Å$,$c = 17.126(8)~Å$)。我们确定的磁有序结构,得出的结论是,低于$T_\mathrm{N} = 19.5~\mathrm{K}$的材料经历了一个过渡到一个部分有序的反铁磁状态。磁性结构与这种材料中存在的环形有序相一致。我们进一步测试的建议发生在$330~\mathrm{mK}$的第二次磁转变,得出的结论是,在这些温度下观察到的热力学异常不反映修改的磁结构。我们的研究提供了一个一致的图片的结构和磁性的相互关系,在挫折磁铁UNI $_4$ B以前未解决。

英文摘要:

We present an extensive powder and single-crystal neutron scattering investigation of the crystallographic structure and magnetic order of the frustrated metallic $f$-electron magnet UNi$_4$B. We carry out a full refinement of the crystallographic structure and conclude that the low-temperature lattice symmetry is orthorhombic (space group Pmm2; cell parameters: $a = 6.963(4)~Å$ , $b = 14.793(9)~Å$ , $c = 17.126(8)~Å$). We determine the magnetically ordered structure, concluding that below $T_\mathrm{N} = 19.5~\mathrm{K}$ the material undergoes a transition into a partially ordered antiferromagnetic state. The magnetic structure is consistent with the existence of toroidal order in this material. We further test the proposal of a second magnetic transition occurring at $330~\mathrm{mK}$, concluding that the thermodynamic anomalies observed at these temperatures do not reflect modifications of the magnetic structure. Our study provides a consistent picture of the interrelationship of structural and magnetic properties in the frustrated magnet UNi$_4$B previously unresolved.

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