AI 中文总结
研究扭曲蜂窝晶格化合物KCuInP2O8，结合多种方法，通过密度泛函理论等揭示其电子结构与磁交换层次，构建有效哈密顿量并用蒙特卡罗模拟研究磁响应，结果表明其为准二维量子反铁磁体，提供相关理论框架。
AI 中文摘要
我们通过实验测量、第一性原理计算和量子蒙特卡罗模拟相结合的方法，研究了扭曲蜂窝晶格化合物KCuInP2O8的电子结构和磁性。GGA+U框架内的密度泛函理论计算表明，KCuInP2O8是一种间接带隙绝缘体，具有Cu2+局域磁矩和由自旋轨道耦合引起的有限磁晶各向异性。利用磁力定理对磁交换相互作用的微观评估揭示了耦合的显著层次结构，次近邻相互作用主导近邻交换，而层间耦合可忽略不计。这种交换层次结构自然地将系统映射到嵌入扭曲蜂窝晶格中的弱耦合反铁磁自旋链上。基于从头算估计的交换相互作用，我们构建了一个有效的自旋半哈密顿量，并使用大规模量子蒙特卡罗模拟研究其磁响应。计算得到的温度依赖磁化率和场依赖磁化强度定量地再现了实验行为，并捕捉到了低维量子磁性的关键特征，包括宽磁化率最大值和低温下的场诱导饱和。我们的结果表明，KCuInP2O8是一种由耦合自旋链组成的准二维量子反铁磁体，提供了一个将电子结构、交换相互作用和集体磁行为联系起来的一致理论框架。
英文摘要
We investigate the electronic structure and magnetic properties of the distorted honeycomb lattice compound KCuInP2O8 through a combination of experimental measurements, first principles calculations and quantum monte carlo simulations. Density functional theory calculations within the GGA+U framework establishes KCuInP2O8 as an indirect gap insulator with Cu2+ local moments and finite magnetocrystalline anisotropy arising from spin orbit coupling. A microscopic evaluation of magnetic exchange interactions using the magnetic force theorem reveals a pronounced hierarchy of couplings, with the next nearest neighbor interaction dominating over the nearest neighbor exchange, while interlayer couplings remain negligible. This exchange hierarchy naturally maps the system onto weakly coupled antiferromagnetic spin chains embedded in a distorted honeycomb lattice. Motivated by the ab initio estimated exchange interactions, we construct an effective spin half Hamiltonian and investigate its magnetic response using large scale quantum Monte Carlo simulations. The calculated temperature dependent susceptibility and field dependent magnetization quantitatively reproduce the experimental behavior and capture key signatures of low dimensional quantum magnetism, including a broad susceptibility maximum and a field induced saturation at low temperatures. Our results establish KCuInP2O8 as a quasi-two-dimensional quantum antiferromagnet composed of coupled spin chains, providing a consistent theoretical framework that links electronic structure, exchange interactions, and collective magnetic behavior.
CommentsPublished in Physica Status Solidi (RRL) - Rapid Research Letters
Journal refPhysica Status Solidi (RRL) 20, e202600001 (2026)
