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巨大的载体移动性在室温铁磁VSi2N4单层中
Lei Qiao1, Musen Li1,2, Yaning Cui1
1Institute for Quantum Science and Technology, International Center of Quantum and Molecular Structures, Materials Genome Institute, Physics Department, Shanghai University, Shanghai 200444, People's Republic of China.
Nano letters
|May 20, 2024
概括
研究了化酸 (VSN) 的两个阶段. H阶段显示出高载体流动性和室温铁磁性,而应变可以调整纳米电子应用的T阶段.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算材料科学科学 计算材料科学
背景情况:
- 二维 (2D) 磁性材料对于下一代电子产品至关重要.
- 了解相位转换和应变效应是优化材料性能的关键.
研究的目的:
- 为了研究二相瓦纳化 (VSN) 的结构,电子和磁性特性.
- 探索双轴应变对VSN相位稳定性和磁性特性的影响.
- 评估VSN作为纳米电子应用的潜在材料.
主要方法:
- 用密度函数理论 (DFT) 的计算来研究VSN阶段.
- 蒙特卡洛 (MC) 模拟被用来分析压力下的库里温度 (TC).
- 计算了载体移动性,频段间隙和相位过渡特征.
主要成果:
- 确定了VSN的新"T阶段",通过3%的双轴拉伸应变稳定.
- 本质的"H相"表现出巨大的载体流动性 (1 × 106 cm2 V-1 s-1),居里温度高于室温,以及2.01 eV的带间隙.
- 在 H-T 阶段过渡中,带间隙在 Γ 点上转移到 2.59 eV.
- 应变可以调节T相的基里温度,在-4%的双轴应变下实现室温稳定.
结论:
- 对于二维磁性材料来说,VSN,特别是H相,表现出了特殊的性能.
- 应变工程提供了一个可行的途径来调整VSN的磁性和电子特性.
- VSN是未来纳米电子设备的一个非常有前途的材料.
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