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相关概念视频

The Hall Effect01:30

The Hall Effect

2.7K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K
Valence Bond Theory02:42

Valence Bond Theory

9.7K
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...
9.7K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

44.7K
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,...
44.7K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.2K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.2K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.2K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
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相关实验视频

Updated: Sep 12, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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在MnPS3中具有很大的热霍尔效应.

Mohamed Nawwar1, Robin R Neumann2,3, Jiamin Wen1

  • 1Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, United States of America.

Reports on progress in physics. Physical Society (Great Britain)
|August 7, 2025
PubMed
概括

这项研究研究了MnPS3中的热霍尔效应 (THE),揭示了一个意想不到的大热霍尔角度. 这些发现突显了旋转-失败过渡的意义,并表明了当前关于磁声合理论的局限性.

关键词:
在 MnPS3 MnPS3玛格南极子子 极子 极子热的霍尔效应是一个热的霍尔效应.

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Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 固态物理 固态物理
  • 材料科学 材料科学 材料科学

背景情况:

  • 热霍尔效应 (THE) 可以来自磁子,声子或磁子-极子相互作用.
  • 在Fe2Mo3O8中观察到的磁极子霍尔效应,表现出显著的大热霍尔信号.
  • 作为一种绝缘抗铁磁体的 MnPS3,表现出旋转转和强大的磁弹性合,因此非常适合研究旋转格合对 THE 的效应.

研究的目的:

  • 为了研究MnPS3中的热霍尔效应,重点关注其旋转转过渡的影响.
  • 分析MnPS3中大型热霍尔信号的起源及其与自旋格子合的关系.
  • 评估当前理论模型在解释MnPS3.3中观察到的THE方面的充分性.

主要方法:

  • 在MnPS3中实验测量热霍尔效应,低至4K.
  • 分析材料的磁性和热性质,特别是在旋转转过渡过程中.
  • 实验结果与理论计算的比较,基于马格诺-波拉龙贝里曲率.

主要成果:

  • 在MnPS3中观察到一个异常大的热霍尔角度,持续到4K.
  • 标准的理论计算无法重现实验中的THE,这表明需要改进的模型.
  • 旋转失败过渡被确定为影响MnPS3.3热性质的关键因素.

结论:

  • 该研究表明,自旋晶格合在MnPS3.3的热霍尔效应中起着重要作用.
  • 目前的理论还不能完全捕捉出对所观察到的THE负责的复杂的磁声声互动.
  • 需要进一步的理论发展,以了解横向热传输中的磁声声合和散射.