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arXiv 2006.06273cond-mat.str-el
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阻挫三角晶格材料CuMnO $_2$中的自旋链关联

Spin-chain correlations in the frustrated triangular lattice material CuMnO$_2$

Simon A. J. Kimber, Andrew Wildes, Hannu Mutka, Jan-Willem G. Bos, Dimitri N. Argyriou

摘要:

伊辛三角晶格仍然是受抑磁性的经典测试案例。在这里,我们报告的CuMnO $_2$,它由一个扭曲的晶格Mn $^{3+}$自旋与单离子各向异性的短程磁序的中子散射测量。CuMnO $_2$上的物理性质测量与各向异性轨道占据引起的一维相关性一致。然而,在粉末测量中观察到的漫磁中子散射先前已经由2D Warren型相关性拟合。使用中子能谱,我们表明,顺磁波动持续到$\sim$ 25 meV以上TN= 65 K。这与典型衍射仪的入射能量相当,并导致能量积分信号的拖尾,因此不能在准静态近似下进行分析。我们使用低能量XYZ极化中子散射提取纯磁(准)静态信号。这是由反向蒙特卡罗分析,这表明,在三角形层中的两个方向是完全受挫的经典自旋液相在75 K。强的反铁磁关联只发现沿b轴,因此,我们的结果统一的中子散射和宏观物理性质测量所看到的图片。

英文摘要:

The Ising triangular lattice remains the classic test-case for frustrated magnetism. Here we report neutron scattering measurements of short range magnetic order in CuMnO$_2$, which consists of a distorted lattice of Mn$^{3+}$ spins with single-ion anisotropy. Physical property measurements on CuMnO$_2$ are consistent with 1D correlations caused by anisotropic orbital occupation. However the diffuse magnetic neutron scattering seen in powder measurements has previously been fitted by 2D Warren-type correlations. Using neutron spectroscopy, we show that paramagnetic fluctuations persist up to $\sim$25 meV above TN= 65 K. This is comparable to the incident energy of typical diffractometers, and results in a smearing of the energy integrated signal, which hence cannot be analysed in the quasi-static approximation. We use low energy XYZ polarised neutron scattering to extract the purely magnetic (quasi)-static signal. This is fitted by reverse Monte Carlo analysis, which reveals that two directions in the triangular layers are perfectly frustrated in the classical spin-liquid phase at 75 K. Strong antiferromagnetic correlations are only found along the b-axis, and our results hence unify the pictures seen by neutron scattering and macroscopic physical property measurements.

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