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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

12.9K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
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Superconductor01:24

Superconductor

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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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Types Of Superconductors01:28

Types Of Superconductors

1.7K
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...
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Ferromagnetism01:31

Ferromagnetism

2.8K
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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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

2.0K
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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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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二次元のCO2層における超伝導性

Kazunori Takada1, Hiroya Sakurai, Eiji Takayama-Muromachi

  • 1Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan. takada.kazunori@nims.go.jp

Nature
|March 7, 2003
PubMed
まとめ
この要約は機械生成です。

研究者らは,新しいコバルト酸化物,Na(x) CoO2*yH2Oの層状の超伝導性を発見しました. この発見は,銅酸化物層が高過渡温度 (高Tc) 超伝導性にとって不可欠であるという長年にわたる信念に異議を唱える.

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関連する実験動画

Last Updated: May 5, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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科学分野:

  • マテリアルサイエンス 材料科学
  • 凝縮物質物理学 凝縮物質物理学
  • 固体化学 固体化学

背景:

  • 層状の銅酸化物における高トランジション温度 (high-T(c)) 超伝導性の発見は,他の層状の金属酸化物における同様の現象に関する広範な研究を促した.
  • コバルトやニッケルを含む3D移行金属酸化物に関する以前の調査は,超伝導性を得ることができず,銅酸化物層が不可欠であるという仮説に至った.

研究 の 目的:

  • 銅ベースの化合物を超えて,層状の金属酸化物における超伝導性の可能性を調査する.
  • コバルト酸ナトリウム水合物 (Na(x) CoO2*yH2O) の超伝導性を調査する.

主な方法:

  • 特定のステキオメトリー (x ≈ 0.35, y ≈ 1.3) を有するNa(x) CoO2*yH2Oの合成と特徴付け.
  • 適切な実験技術を使用して,超伝導的移行温度 (T ((c)) の測定.

主要な成果:

  • Na(x) CoO2*yH2Oは,T(c) が約5Kの超伝導体として特定されました.
  • この化合物は,Na+イオンとH2O分子の絶縁層によって分離された二次元CoO2層を特徴としています.
  • 超伝導性の性質は,高T (c) 銅酸化物と非常に類似しています.

結論:

  • Na(x) CoO2*yH2Oにおける超伝導性の発見は,コバルト酸化物の層状に超伝導性が起こる可能性があることを示しています.
  • 観測された超伝導特性における類似性は,コバルト酸とコプラート酸の超伝導体間の類似した基礎物理を示唆しています.
  • この発見は,超伝導性を示す材料の範囲を拡大し,非従来の超伝導性に関する研究のための新しい道を開きます.