重原子集群链具有强大的自旋轨道合和磁性子在Mn[PtBi6I12]
Maria A Herz1,2, Julia-Maria Hübner1, Jörg Sichelschmidt3
1Faculty of Chemistry and Food Chemistry, TUD Dresden University of Technology, 01062 Dresden, Germany.
Inorganic chemistry
|December 5, 2024
概括
研究人员发现了Mn[PtBi6I12,一种新的半导体材料. 这种富含石的化合物具有可调节的导电性和磁性,使其成为螺旋电子应用的潜在候选者.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 寻找具有强大的自旋轨道合的新型磁拓绝缘体对于推进自旋电子学至关重要.
- 之前的概念框架指导了有前途的材料的发现.
研究的目的:
- 发现和描述具有潜在磁性和拓性质的新 bismuth 丰富的 subiodide 化合物.
- 研究新合成材料的结构,电子和磁性特性.
主要方法:
- 从元素混合物和BiI3中生长单晶.
- 单晶X射线衍射用于结构确定.
- 密度函数理论 (DFT) 计算用于电子带结构分析.
- 电阻测量和电子自旋共振 (ESR) 光谱.
主要成果:
- 发现了Mn[PtBi6I12,这是一种半导体,具有带面体结构,包括[PtBi6I12]2-离子和Mn2+离子.
- 由于Mn2+被Bi3+替换和空隙形成而观察到的相宽,由 (Mn1-3Bi2) [PtBi6I12]表示.
- 通过DFT计算证实拓学上微不足道的带间隙;导电性通过非固体测量 (n-和p-自补剂) 显著增强,特别是在链条上.
- 在室温下具有参磁性行为,旋转相关性增加,内部场积累低于30K,如ESR所示.
结论:
- Mn[PtBi6I12]是一种具有调节导电性和有趣磁性质的新型半导体.
- 材料的非固态度对其导电性起着关键作用.
- 对其磁性和电子性质的进一步研究可能会导致在自旋电子学和材料科学中的应用.
更多相关视频
10:42Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10.6K
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
8.1K
相关概念视频
03:02Colors and Magnetism
11.5K
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...
11.5K
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
00:59Atomic Nuclei: Nuclear Magnetic Moment
1.0K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.0K
02:58Crystal Field Theory - Octahedral Complexes
26.2K
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...
26.2K
01:03Atomic Nuclei: Nuclear Spin State Overview
866
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
866
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.5K
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,...
41.5K