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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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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...
1.9K
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,...
2.0K
A Single-Component System01:24

A Single-Component System

68
In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
68
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...
2.8K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

16.4K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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シングルコンポーネントの分子超伝導体.

HengBo Cui1, Hayao Kobayashi, Shoji Ishibashi

  • 1Condensed Molecular Materials Laboratory, RIKEN , Wako-shi, Saitama 351-0198, Japan.

Journal of the American Chemical Society
|May 13, 2014
PubMed
まとめ
この要約は機械生成です。

超伝導性は,高圧 (約7.5-8.7GPa) の下にある分子導体[Ni(hfdt) 2で発生する. 絶縁状態から超伝導状態へのこの移行は,電子帯域構造の圧力による変化と関連しています.

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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:

  • 単一コンポーネント分子導体は,電子アプリケーションに有望である.
  • 化合物[Ni(hfdt) 2は,環境圧で半導体特性を示す.
  • 圧力効果を理解することは,材料の特性を調節するために非常に重要です.

研究 の 目的:

  • [Ni(hfdt) ]2における抵抗力の圧力依存を調査する.
  • 圧力が誘発した超伝導体の移行を決定するために.
  • 結晶構造,電子帯構造,超伝導性の関係を解明する.

主な方法:

  • ダイヤモンドアンビルセルを使用した~10GPaまでの4プローブレジスティビティ測定.
  • 高圧 (6−11 GPa) で結晶と電子帯構造の第一原理計算.

主要な成果:

  • 低温の保温相は7.5GPa以上で抑制されます.
  • 7.5-8.7GPaの範囲で観測された超伝導的移行,最大Tcは5.5K.
  • 計算によると,半導体帯構造は最大6GPaで,電子と穴のフェルミ表面は8GPaで現れる.

結論:

  • 高圧は[Ni(hfdt) 2の超伝導相を誘導する.
  • 超伝導性の出現は,絶縁相の抑制とフェルミ表面の出現と相関する.
  • 第一原理の計算は,圧力による電子構造変化の実験的観測を裏付けている.