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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.9K
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...
26.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

43.1K
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,...
43.1K
Colors and Magnetism03:02

Colors and Magnetism

12.0K
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...
12.0K
Valence Bond Theory02:42

Valence Bond Theory

8.8K
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...
8.8K
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

42.5K
Effect of Lone Pairs of Electrons on Molecule Geometry
42.5K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

2.6K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
2.6K

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関連する実験動画

Updated: Jul 25, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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EuRbFe4におけるスメティックペア密度波の順序として4

He Zhao1, Raymond Blackwell1, Morgan Thinel2,3

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, USA.

Nature
|June 28, 2023
PubMed
まとめ
この要約は機械生成です。

研究者は,EuRbFe4As4超伝導体で新しいゼロフィールドペア密度波 (PDW) 状態を発見しました. この状態は,他の有秩序な状態から独立してユニークな超伝導ギャップの調節を示し,従来の超伝導性に新しい洞察を提供します.

さらに関連する動画

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

17.7K

関連する実験動画

Last Updated: Jul 25, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

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科学分野:

  • 凝縮物質物理学
  • 超伝導性の研究
  • 材料科学

背景:

  • ペア密度波 (PDW) は,超伝導状態で変換対称性を破るものである.
  • これまでのPDWの証拠は,高磁場または他の命令と共存に限定されていました.
  • ゼロフィールドのPDWは 他の州から独立して 捉え難いままです

研究 の 目的:

  • 主要な,ゼロフィールドペア密度波 (PDW) 状態の存在を調査する.
  • 鉄のプニクチド EuRbFe4As4 の超伝導性の性質を特徴づけること.
  • PDW,磁気,および他の電子命令の間の関係を決定する.

主な方法:

  • スペクトル画像スキャニングトンネル顕微鏡 (SI-STM) が使用された.
  • SI-STMの発見を裏付けるために,大量測定が行われました.
  • 温度と磁場の変化はPDW状態を検知するために使用されました.

主要な成果:

  • EuRbFe4As4でゼロフィールドのPDW状態が確認された.
  • 超伝導ギャップの長距離,一方的な調節が観察されました.
  • PDW状態は磁気 (Tm ≈ 15 K) と超伝導性 (Tc ≈ 37 K) と共存する.
  • PDW状態はTm以上で消滅し,転移と回転の対称性が回復する.

結論:

  • EuRbFe4As4は,他の密度波の順序から独立した,原始的な,ゼロフィールドのPDW状態を宿している.
  • この材料のPDW状態は,スメティックな順序を示しています.
  • この発見により 非従来の超伝導状態の理解が進んでいます