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相关概念视频

Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

6.4K
When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
6.4K
Superconductor01:24

Superconductor

1.9K
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
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...
1.7K
Electrical Conductivity01:13

Electrical Conductivity

2.1K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
2.1K
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
Inductance: Solid Cylindrical Conductor01:24

Inductance: Solid Cylindrical Conductor

1.1K
To calculate the inductance of a solid cylindrical conductor, consider a 1-meter section of a non-magnetic, current-carrying conductor with radius r. Disregarding end effects and assuming uniform current density, Ampere's law helps determine the magnetic field inside the conductor. This law states that the magnetic field intensity H is concentric and constant within the conductor.
Given the uniform current distribution, the magnetic field Hx and flux density Bx inside the conductor are...
1.1K

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相关实验视频

Updated: May 6, 2026

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
06:56

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在20K压缩中的超导性.

Katsuya Shimizu1, Hiroto Ishikawa, Daigoroh Takao

  • 1Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. kshimizu@mp.es.osaka-u.ac.jp

Nature
|October 11, 2002
PubMed
概括
此摘要是机器生成的。

在30 GPa以上的压力下,变得超导,达到20 K的过渡温度.这一发现支持预测金属等轻元素中高温超导的理论.

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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
  • 量子力学就是量子力学.

背景情况:

  • 在高温下的超导性是理论上预测在极端压力下的轻元素.
  • 传统的BCS理论表明,原子数较低的元素可能表现出超导性.
  • 预计金属在室温以上的压力超过400GPa时会超导.

研究的目的:

  • 为了研究 (Li) 的超导性,比以前研究的压力更低.
  • 通过实验证实或反驳之前对Li.的超导性的初步观测.
  • 为低原子数和高超导过渡温度之间的相关性提供证据.

主要方法:

  • 在样本上施加高压 (大于30 GPa).
  • 在压力下测量的电阻,以检测超导过渡.
  • 分析压力依赖的过渡温度 (T(c)).

主要成果:

  • (Li) 在超过30 GPa的压力下表现出超导性.
  • 观察到一个压力依赖的超导过渡温度 (Tc),在48GPa时达到20K.
  • 这代表了任何元素的最高确认的T (c),验证了早期的初步发现.

结论:

  • 这项研究证实,在可获得的压力下,变得超导.
  • 结果支持这样一个假设:光元素可以达到高超导过渡温度.
  • 这些发现表明,金属确实可以表现出非常高的T (c) 超导性.