相关实验视频
Updated: Jun 11, 2025
08:45
Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
9.5K
在 iridate/manganite 异构结构中,原子控制的绝缘体到金属的过渡
Enyang Men1,2, Deyang Li1,2, Haiyang Zhang1,2
1Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, China.
Nature communications
|September 28, 2024
概括
研究人员在由相关的绝缘体组成的异构结构中发现了绝缘体到金属的过渡. 这种由界面电荷转移驱动的过渡,可以根据 iridate (CaIrO3) 层的厚度调整,甚至可以调整到单个单元细胞.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
背景情况:
- 全绝缘体异构结构是材料科学中新兴金属性的关键.
- 通常,这些结构涉及带隔热器,但这不是严格的要求.
- 相关绝缘体为新的电子现象提供独特的特性.
研究的目的:
- 研究所有相关绝缘体异构结构中的新兴现象.
- 在CaIrO3/La0.67Sr0.33MnO3系统中探索绝缘体到金属的过渡.
- 了解介面电荷转移和有效相关性在这种转变中的作用.
主要方法:
- 使用CaIrO3和La0.67Sr0.33MnO3.3制造全相关绝缘体异构结构.
- 在CaIrO3层厚度的系统变化.
- 电导率,磁化和磁电阻的表征.
- 对电子和晶体结构的界面电荷转移效应的分析.
主要成果:
- 观察到依赖CaIrO3厚度的绝缘体到金属的过渡.
- 磁化,导电性和电磁阻的同时增强表明了透类型的过渡.
- 过渡发生在低 iridate 体积分数时,由界面电荷转移驱动.
- 有效的相关性起着至关重要的作用,将关键厚度降低到单个单元细胞.
结论:
- 在所有相关的绝缘体异构结构中,可以实现新兴金属性.
- 接口电荷转移显著改变了散装电子和晶体特性.
- 绝缘体到金属过渡的临界厚度可以根据材料组成和结构进行调整,这突显了有效相关性的重要性.
相关概念视频
01:24Metal-Semiconductor Junctions
307
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
307
02:32Bonding in Metals
46.9K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
46.9K
02:58Properties of Transition Metals
25.2K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.2K
02:54Trends in Lattice Energy: Ion Size and Charge
23.8K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.8K
03:02Colors and Magnetism
11.6K
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...
11.6K