标题： 自旋冰材料 Dy_2 Ti_2 O_7 的低温状态研究 显示英文标题

标题： Investigation into the low temperature state of the spin-ice material Dy_2 Ti_2 O_7

摘要： 自旋冰材料DTO的热平衡性质，包括比热、磁化率和自旋关联，可以通过一个包含至第三近邻磁相互作用和长程偶极力的模型成功再现。 使用最佳拟合参数，该模型预测了一个打破晶格立方对称性的有序基态。 在本工作中，我们分析了一项中子散射实验的结果，在该实验中，尽管冷却非常缓慢，但在300mK下观察到了扩散图案，而不是尖锐的布拉格峰 [A. M. Samarakoon 等，Physical Review Research 4, 033159 (2022).]。 使用反向蒙特卡罗方法，我们找到了相容的自旋构型，分析了反铁磁自旋链作为基态构建块的适用性，并提供了各种关联度量及其能量。 我们的分析表明，虽然实验配置中不存在无限长的链，但反铁磁自旋链能够很好地近似数据。 有迹象表明可能存在短程链的证据，但需要进一步研究以确认。 显示英文摘要

摘要： The thermal equilibrium properties of the spin-ice material DTO, including specific heat, magnetization, and spin correlations, could be successfully reproduced by a model featuring magnetic interactions up to the third nearest neighbor and long-ranged dipolar forces. With the best-fit parameters, the model predicts an ordered ground state which breaks the cubic symmetry of the lattice. In this work, we analyze results from a neutron scattering experiment in which, instead of sharp Bragg peaks, a diffuse pattern was observed down to 300mK, despite very slow cooling [A. M. Samarakoon et al., Physical Review Research 4,033159 (2022).]. Using a reverse Monte Carlo approach, we found compatible spin configurations, analyze the suitability of antiferromagnetic spin chains as building blocks for the ground-state and provide various measures of correlation and calculate their energy. Our analysis suggests that while infinitely long chains are not present in the experimental configuration, antiferromagnetic spin chains provide a good approximation of the data. There are indications of possible evidence for short-range chains, but further investigation is needed for confirmation.