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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (1): 142-150.DOI: 10.16553/j.cnki.issn1000-985x.2025.0059

• 研究论文 • 上一篇    下一篇

二维单层TiCuX2(X=S, Se, Te)的第一性原理研究

梁志强(), 常蓉   

  1. 甘肃省计量研究院,兰州 730070
  • 收稿日期:2025-03-26 出版日期:2026-01-20 发布日期:2026-02-05
  • 作者简介:梁志强(1983—),男,甘肃省人,硕士,高级工程师。E-mail:309952639@qq.com

First-Principles Study on Two-Dimensional Monolayer TiCuX2 (X=S, Se, Te)

LIANG Zhiqiang(), CHANG Rong   

  1. Gansu Institute of Metrology,Lanzhou 730070,China
  • Received:2025-03-26 Online:2026-01-20 Published:2026-02-05

摘要: 为探究二维磁性材料中过渡金属原子数量对磁性的影响,以及寻找具有优良性质的磁性二维材料,本文基于密度泛函理论,借助第一性原理计算软件VASP,对二维单层TiCuX2(X=S,Se,Te)进行了系统的理论研究。主要计算了三种材料的电子结构、稳定性、磁性、原子交换相互作用、居里温度。形成能和声子谱的计算结果证明了这三种材料的稳定性;电子结构和磁性计算分析表明,除TiCuS2呈现磁性外,三种材料均表现出铁磁性。此外,基于PBE+U和杂化泛函,也对三种材料进行了更深入的理论研究,发现三种结构磁矩均呈现出1 μB的整数磁矩,并且三种材料均保持磁性。最后,基于海森堡模型,并结合交换相互参数,利用蒙特卡洛方法计算了三种结构的居里温度。

关键词: 第一性原理; 二维磁性材料; TiCuX2; 电子结构; 居里温度

Abstract: In order to explore the influence of the number of transition metal atoms on the magnetic properties of two-dimensional magnetic materials, and to find magnetic two-dimensional materials with excellent properties, based on density functional theory, with the aid of first-principles calculation software VASP, a systematic theoretical study of two-dimensional monolayer TiCuX2 (X=S, Se, Te) was carried out. The electronic structure, stability, magnetism, atomic exchange interaction and Curie temperature of three materials of TiCuX2 (X=S, Se, Te) were calculated. The stability of three materials are proved by the calculation results of formation energy and phonon spectrum. The electronic structure and magnetic calculation analysis show that the three materials exhibit semi metallic ferromagnetism except TiCuX2 which is magnetic. In addition, based on PBE+U and hybrid functional theory, a deeper theoretical study of the three materials were carried out in this paper, and the results show that the magnetic moments of three structures are all integer magnetic moments of 1 μB, and three materials remain magnetic. Finally, based on the Heisenberg model and the exchange of mutual parameters, the Curie temperatures of three structures were calculated by Monte Carlo method.

Key words: first-principle; two-dimensional magnetic material; TiCuX2; electronic structure; Curie temperature

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