在双晶 Cu1-EuO 半导体中依赖结构的自旋极化电子传输
Kewei Zhang1, Xi Chen1, Mingyan Chuai2,3
1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China. zhangmz@jlu.edu.cn.
Physical chemistry chemical physics : PCCP
|March 14, 2024
概括
用欧欧添加的双铜氧化物表现出室温铁磁性和p型到n型半导体的过渡. 这种材料显示出显著的异常霍尔效应,这使得它对自旋电子应用具有前景.
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
- 纳米技术 纳米技术
背景情况:
- 双铜氧化物 (Cu2O) 是一个有前途的半导体材料.
- 用稀土元素进行兴奋剂可以改变氧化物的电子和磁性特性.
- 螺旋电子需要具有可控制磁性和电子性质的材料.
研究的目的:
- 合成和表征用欧 (Eu) 添加的双铜氧化物 (双 Cu1-xEuxO).
- 为了研究欧对双胞胎CuO的磁性,电子性和传输性质的影响.
- 用第一原则计算来阐明观察到的现象背后的机制.
主要方法:
- 气液相化学沉积与高温氧化相结合,用于合成.
- 振动样品磁力计 (VSM) 用于磁性属性分析.
- 霍尔效应测量用于电荷载体类型和移动性确定.
- 第一个原则是用于理论洞察的计算模拟.
主要成果:
- 欧化双子CuO表现出显著的室温铁磁性.
- 和磁化达到0.82的峰值在% Eu doping. 的情况下.
- 观察到一个从p型到n型半导体的过渡,随着Eu度的增加.
- 记录了显著的异常霍尔效应,异常霍尔系数的最大值和霍尔导电性移动性在0.82%的欧欧兴奋剂.
- 第一个原则计算揭示了欧多在增强边向跳跃和斜散射机制方面的作用,影响了异常的霍尔效应.
结论:
- 欧化双CuO是一种有前途的材料,用于自旋电子应用,因为其室温铁磁性和异常的霍尔效应.
- 观察到的现象归因于Eu 4f状态和电荷载体之间的相互作用,这些相互作用是由分散机制调节的.
- 这项研究为开发新的基于CuO的双胞胎spintronic设备提供了一条途径.
更多相关视频
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.1K
09:00Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
9.9K
相关概念视频
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.5K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.5K
02:58Crystal Field Theory - Octahedral Complexes
26.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.4K
03:02Colors and Magnetism
11.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.7K
03:06The Pauli Exclusion Principle
37.0K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
37.0K
01:20Types of Semiconductors
594
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
594
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K