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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

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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...
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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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在量子磁铁中不常见的磁性排序 Yb_{3}Ga_{5}O_{12}

S Raymond1, E Lhotel2, E Riordan2

  • 1<a href="https://ror.org/02rx3b187">Université Grenoble Alpes</a>, CEA, IRIG, MEM, MDN, 38000 Grenoble, France.

Physical review letters
|December 23, 2024
PubMed
概括

研究人员使用中子衍射确定了Ytterbium Gallium Garnet (Yb_{3}Ga_{5}O_{12}) 的反铁磁结构. 这揭示了不寻常的磁性秩序,并表明这种几何挫败的磁体中存在显著的量子波动.

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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
  • 磁力学 磁力学 是一种

背景情况:

  • 伊特尔花 (Yb_{3}Ga_{5}O_{12}) 是一种具有复杂磁性行为的材料.
  • 之前的研究发现,在T_{λ}=54mK时发生磁性转变.
  • 了解磁体结构对于探索奇特的磁现象至关重要.

研究的目的:

  • 确定Yb_{3}Ga_{5}O_{12}在过渡温度以下的特定反铁磁结构.
  • 为了研究竞争相互作用 (交换与二极) 在这个几乎同位素系统中的作用.
  • 探索观察到的磁结构对量子波动和几何丧的影响.

主要方法:

  • 进行了中子衍射实验,以探测磁结构.
  • 对衍射模式的分析确定了磁传播向量.
  • 研究的磁性属性低于磁性订单温度 (T_{λ}).

主要成果:

  • 在T_{λ}=54mK以下确定了Yb_{3}Ga_{5}O_{12}的反铁磁结构.
  • 确定了k=(1/2,1/2,0) 的磁传播向量,这对于石榴石结构来说是不寻常的.
  • 减少的有序磁矩表明存在显著的量子波动.

结论:

  • 复杂的磁性结构突出了交换和双极相互作用之间的相互作用.
  • 这些发现提供了对丧磁体中异国情调的磁性结构的实验证据.
  • Yb_{3}Ga_{5}O_{12} 作为一个模型系统,用于研究几何丧磁体中的量子效应.