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Ferromagnetism01:31

Ferromagnetism

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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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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
904
Superconductor01:24

Superconductor

1.0K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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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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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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関連する実験動画

Updated: May 21, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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鉄基超伝導体におけるクーパー対密度調節状態

Lingyuan Kong1,2, Michał Papaj3,4, Hyunjin Kim5,6,7

  • 1T. J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA, USA. lykong@caltech.edu.

Nature
|March 20, 2025
PubMed
まとめ
この要約は機械生成です。

研究者らは,鉄基の超伝導体でペア密度調節 (PDM) と呼ばれる新しい超伝導状態を発見しました. この状態は,以前の密度波の順序とは異なり,格子変換を保存し,複雑な電子システムへの新しい洞察を提供します.

さらに関連する動画

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

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関連する実験動画

Last Updated: May 21, 2025

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子材料について

背景:

  • 超伝導状態は,結晶の空間群の対称性を破り,長波長の密度波の順に導きます.
  • 異なるタイプの調節法であるペア密度調節法 (PDM) は,ユニット内細胞対称性を破ることで格子変換を保存する理論的に提案されているが,実験的に難解である.

研究 の 目的:

  • ペア密度調節 (PDM) 状態の最初の実験観察を報告する.
  • 鉄ベースの超伝導体におけるPDMの特性と起源を調査する.

主な方法:

  • 掃描トンネル顕微鏡 (STM) を使って,剥離されたFeTe${0.55}$Se$_{0.45}$の電子特性を探査した.
  • 実験結果の裏付けと 基礎物理学の解明のために モデル計算を行った.

主要な成果:

  • 網格周期に一致する波長を持つ強固な超伝導的隙間調節が,薄いフレークで観察された.
  • ギャップ・モジュレーションの幅は,平均的な超伝導ギャップの30%を超えました.
  • PDM状態は,鉄亜網間の超伝導性ギャップの違いと,薄片のネマティック歪みから生じることが判明した.

結論:

  • 超伝導材料におけるペア密度調節 (PDM) の最初の実験的証拠を確立した.
  • PDMは,密度波の順序とは異なる亜格子対称性破裂とネマティック性から生じることを示した.
  • 強く相関する電子システムにおける交互に絡み合う順序を探索するための新しい道を開き,鉄ベースの超伝導体の理解を進めた.