Fe2XSi（X=Ti、V）的磁性与电子结构的第一性原理分析
First Principle Analysis of the Magnetism and Electronic Structure of Fe2XSi (X=Ti, V)
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中文总结 AI 辅助
本文通过第一性原理计算，分析Fe2TiSi与Fe2VSi的结构稳定性、电子磁性力学性质及压力调控效应，发现二者基态性质差异显著，且压力可调控其带隙或磁性。
中文摘要 AI 辅助
采用计算方法研究了Fe2XSi（其中X为钛Ti和钒V）的电子、磁性和力学性质。体积优化结果显示，Fe2TiSi的基态为非磁性窄带隙半导体，Fe2VSi的基态为亚铁磁金属；两种材料的形成能均为负值，证实了其晶体结构的稳定性。力学性质分析确认了晶体结构的静态稳定性，结果表明钛化合物具有延展性，而钒材料具有脆性。态密度和能带结构研究进一步证实，钛材料具有间接带隙（在Γ和X点）的非磁性半导体特性，钒材料具有亚铁磁金属特性。对晶体结构施加张力（负压力）和压缩（正压力）后，研究了材料的电子和磁性性质：Fe2TiSi的压力研究显示其带隙可调，且可能发生半导体-金属转变；Fe2VSi的压力研究显示其磁矩可调，且可能发生低自旋/高自旋磁性转变。
英文摘要
The electronic, magnetic, and mechanical properties of Fe2XSi, where X is titanium (Ti) and vanadium (V), are investigated using computational methods. Volume optimization reveals that the ground state of Fe2TiSi is a nonmagnetic narrow-band gap semiconductor, and that of Fe2VSi is a ferrimagnetic metal. The negative formation energies of both materials confirm the stability of their crystal structures. Mechanical properties confirm the static stability of the crystal structure and suggest that the titanium compound is ductile; however, the vanadium material is brittle. Density of states and band structure studies confirm the nonmagnetic semiconducting nature with an indirect band gap at Γ and X for the titanium material and the ferrimagnetic-metallic nature of the vanadium material. Electronic and magnetic properties of the materials were investigated with applied tension (negative pressure) and compression (positive pressure) to the crystal structure. The pressure study on Fe2TiSi shows a tunable band gap and a possible semiconductor-metal transition, and Fe2VSi shows a tunable magnetic moment and a possible low-spin/high-spin magnetic transition.
发表机构
- Bergen Community College（Bergen 社区学院）
- College of Staten Island（史坦顿岛学院）
机构由 AI 辅助整理，请以论文原文为准。
