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arXiv 2007.03268cond-mat.str-el
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准一维阻挫反铁磁体SrCuTe $_2$ O $_6$的磁性和磁结构

Magnetic properties and magnetic structure of the frustrated quasi-one-dimensional antiferromagnet SrCuTe$_2$O$_6$

P. Saeaun, Y. Zhao, P. Piyawongwatthana, T. J. Sato, F. C. Chou, M. Avdeev, G. Gitgeatpong, K. Matan

摘要:

在三个不同的高对称方向$[100]$、$[110]$和$[111]$上施加磁场,对单晶立方SrCuTe $_2$ O $_6$的磁化强度进行了测量,结果表明其磁各向异性较弱.磁化率与海森堡自旋链模型的量子蒙特卡罗模拟结果的拟合,其中链是通过占主导地位的第三近邻交换相互作用$J_3$形成的,得到链内相互作用$(J_3/k_B)$在50.12(7)K(沿$[110]$施加场)和52.5(2)K(沿$[100]$施加场)之间,大约相同的$g$因子为2.2。单晶中子衍射揭示了磁有序态的转变,证明了在$T_\textrm{N1}=5.25(9)$ K的磁布拉格强度的开始,没有异常的第二次过渡在$T_\textrm{N2}$先前报道。基于不可约表示理论和对粉末和单晶中子衍射数据的磁空间群分析,提出了Cu-$^{2+}$ ~ $S=1/2$自旋反铁磁排列的Shubnikov空间群$P4_132$的磁结构.测量的有序矩的$0.52(6)~μ_B$,这代表了48%的减少,从预期值的$1~μ_B$,表明剩余的影响挫折导致的$J_1$和$J_2$债券。

英文摘要:

Magnetization measurements on single-crystal cubic SrCuTe$_2$O$_6$ with an applied magnetic field of along three inequivalent high symmetry directions $[100]$, $[110]$, and $[111]$ reveal weak magnetic anisotropy. The fits of the magnetic susceptibility to the result from a quantum Monte Carlo simulation on the Heisenberg spin-chain model, where the chain is formed via the dominant third-nearest-neighbor exchange interaction $J_3$, yield the intra-chain interaction $(J_3/k_B)$ between 50.12(7) K for the applied field along $[110]$ and 52.5(2) K along $[100]$ with about the same $g$-factor of 2.2. Single-crystal neutron diffraction unveils the transition to the magnetic ordered state as evidenced by the onset of the magnetic Bragg intensity at $T_\textrm{N1}=5.25(9)$ K with no anomaly of the second transition at $T_\textrm{N2}$ reported previously. Based on irreducible representation theory and magnetic space group analysis of powder and single-crystal neutron diffraction data, the magnetic structure in the Shubnikov space group $P4_132$, where the Cu$^{2+}$~$S=1/2$ spins antiferromagnetically align in the direction perpendicular to the spin chain, is proposed. The measured ordered moment of $0.52(6)~μ_B$, which represents 48% reduction from the expected value of $1~μ_B$, suggests the remaining influence of frustration resulting from the $J_1$ and $J_2$ bonds.

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