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arXiv 1808.10085cond-mat.str-el
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三元化合物Nd $_2$ O $_3$的物理性质

Physical properties of the trigonal binary compound Nd$_2$O$_3$

G. Sala, M. B. Stone, B. K. Rai, A. F. May, C. R. Dela Cruz, H. Suriya Arachchige, G. Ehlers, V. R. Fanelli, V. O. Garlea, M. D. Lumsden, D. Mandrus, A. D. Christianson

摘要:

我们用中子衍射、非弹性中子散射、热容和磁化率测量研究了Nd $_2$ O $_3$的物理性质。Nd $_2$ O $_3$以三角结构结晶,其中Nd $^{3+}$离子被7个氧阴离子的笼包围。晶体场谱由跨越能量范围3-60 meV的四个激发组成。精细本征函数表示$ab$平面中的XY自旋。由磁化率测量确定$θ_{CW}=-23.7(1)$ K的居里-外斯温度。热容测量显示在550 mK处有一个尖锐的峰值,在1.5 K附近有一个更宽的特征。中子衍射测量结果表明,550 mK的转变对应于长程反铁磁秩序意味着挫折指数$θ_{CW}/T_N\approx43$。这些结果表明,Nd $_2$ O $_3$是一个结构和化学简单的模型系统的挫折所造成的竞争相互作用与占主导地位的XY各向异性的时刻。

英文摘要:

We have studied the physical properties of Nd$_2$O$_3$ with neutron diffraction, inelastic neutron scattering, heat capacity, and magnetic susceptibility measurements. Nd$_2$O$_3$ crystallizes in a trigonal structure, with Nd$^{3+}$ ions surrounded by cages of 7 oxygen anions. The crystal field spectrum consists of four excitations spanning the energy range 3-60 meV. The refined eigenfunctions indicate XY-spins in the $ab$ plane. The Curie-Weiss temperature of $θ_{CW}=-23.7(1)$ K was determined from magnetic susceptibility measurements. Heat capacity measurements show a sharp peak at 550 mK and a broader feature centered near 1.5 K. Neutron diffraction measurements show that the 550 mK transition corresponds to long-range anti-ferromagnetic order implying a frustration index of $θ_{CW}/T_N\approx43$. These results indicate that Nd$_2$O$_3$ is a structurally and chemically simple model system for frustration caused by competing interactions with moments with predominate XY anisotropy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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