NdCl₃中由阻挫诱导的维度约化以及长程和短程磁序的共存
Frustration induced dimensional reduction and coexistence of long and short-range magnetic order in NdCl$_{3}$
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中文总结 AI 辅助
研究NdCl₃磁性，结合体性质测量与中子散射技术。发现低温下有两个磁转变，存在短程与长程磁序共存现象，磁布拉格峰有相关变化，提出准一维行为及序的共存由各向异性交换相互作用的阻挫驱动。
中文摘要 AI 辅助
阻挫现象极大地丰富了量子磁体可及的物理特性。基于此，我们结合体性质测量和中子散射技术研究了NdCl₃的磁性。低温热容揭示了在TN1 = 270 mK和TN2 = 180 mK处的两个磁转变。然而，大部分磁熵在TN1之上释放，表现为以T*≈450 mK为中心的宽峰。单晶弹性中子散射表明在TN2之上有高度各向异性的磁漫散射，证实准一维、短程反铁磁序是热容中宽峰的起源。在TN1以下出现以\(\vec{k}\) = (0 0 \(\frac{1}{2}\))传播矢量为特征的磁布拉格峰。有趣的是，在TN2 < T < TN1时磁漫散射持续存在，表明短程和长程序共存。磁布拉格峰在TN2以下强度额外增加且\(\vec{k}\)不变，同时漫散射消失表明达到完全长程序。虽然有序磁基态的确切性质仍未解决，但观察到的磁散射表明主要是c轴矩且有小的ab平面分量。我们提出准一维行为以及短程和长程序的共存是由各向异性交换相互作用的阻挫驱动的。
英文摘要
The phenomenon of frustration greatly enriches the accessible physics of quantum magnets. With this in mind we study the magnetism of NdCl$_{3}$ using a combination of bulk properties measurements and neutron scattering techniques. The low-temperature heat capacity reveals two magnetic transitions at $T_{N1}$ = 270 mK and $T_{N2}$ = 180 mK. However, much of the magnetic entropy is released above $T_{N1}$, manifesting as a broad peak centered at $T^{*} \approx$ 450 mK. Single crystal elastic neutron scattering reveals highly anisotropic magnetic diffuse scattering above $T_{N2}$, confirming that quasi-one-dimensional, short-range, antiferromagnetic order is the origin of the broad peak in the heat capacity. Magnetic Bragg peaks characterized by a $\vec{k}$ = ($0$ $0$ $\frac{1}{2}$) propagation vector emerge below $T_{N1}$. Interestingly, the magnetic diffuse scattering persists for $T_{N2} < T < T_{N1}$, indicating a regime of coexisting short and long-range order. The magnetic Bragg peaks exhibit an additional increase in intensity below $T_{N2}$ with no change in $\vec{k}$. Concomitantly, the diffuse scattering disappears indicating the attainment of full long-range order. While the precise nature of the ordered magnetic ground state remains unresolved, the observed magnetic scattering indicates predominate $c$-axis moments with a small $ab$-plane component. We propose that the quasi-one-dimensional behavior and the coexistence of short and long-range order are driven by frustration of anisotropic exchange interactions.
