Magnetic properties of LiCu$_3$O$_3$ -- quasi-two-dimensional antiferromagnet on depleted square lattice

A. A. Bush, S. K. Gotovko, V. Yu. Ivanov, V. I. Kozlov, E. G. Nikolaev, L. E. Svistov
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Abstract

LiCu$_3$O$_3$ is a novel 2D S=1/2 antiferromagnet with randomly depleted square lattice. The crystal structure contains two types of square planes with different Cu$^{2+}\rightarrow$ Li$^{+}$ substitution rates (20% and 40%). $^7$Li NMR and magnetization measurements performed on single crystals of LiCu$_3$O$_3$ revealed the occurrence of magnetic order at $T_{c1}=123$ K and the change of the magnetic state at $T_{c2}\approx30$ K. The high temperature transition can be attributed to establishment of magnetic order in planes with higher concentration of magnetic ions and the low temperature transition -- to the magnetic ordering in planes with lower concentration of magnetic ions. Broad continuous NMR spectra below $T_{c1}$ reflect a continuous distribution of values or directions of magnetic moments in LiCu$_3$O$_3$ typical for spiral, spin-modulated magnetic structures or structures with frozen disorder. Magnetization measurements revealed a spin-flop transition which indicates weak uniaxial anisotropy of the spin structure. Relatively small value of magnetic susceptibility at all orientations of applied magnetic field shows that magnetic structure is rigid, since the estimated value of saturation field derived from differential susceptibility measured at $\mu_0 H=5$ T is $\mu_0H_{sat} \approx$200 T.
贫化方格上准二维反铁磁体 LiCu$_3$O$_3$ 的磁特性
LiCu$_3$O$_3$ 是一种新型二维 S=1/2 反铁磁体,具有随机贫化的方形晶格。对 LiCu$_3$O$_3$ 单晶体进行的 $^7$Li NMR 和磁化测量显示,在 $T_{c1}=123$ K 时出现了磁有序,而在 $T_{c2}\approx30$ K 时磁态发生了变化。高温转变可归因于磁性离子浓度较高的平面中磁性有序的建立,而低温转变--则归因于磁性离子浓度较低的平面中磁性有序的建立。低于 $T_{c1}$ 的宽连续 NMR 光谱反映了 LiCu$_3$O$_3$ 中磁矩值或方向的连续分布,这是典型的螺旋、自旋调制磁性结构或冻结无序结构。在外加磁场的所有方向上,磁感应强度值相对较小,这表明磁性结构是刚性的,因为在 $\mu_0 H=5$ T 时测量的差分磁感应强度得出的饱和磁场估计值为 $\mu_0H_{sat} 。\约为 200 T。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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