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相关概念视频

Superconductor01:24

Superconductor

1.7K
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...
1.7K
Types Of Superconductors01:28

Types Of Superconductors

1.6K
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...
1.6K
Ferromagnetism01:31

Ferromagnetism

2.9K
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...
2.9K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.7K
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,...
1.7K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.3K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.3K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.2K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.2K

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相关实验视频

Updated: Jan 9, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

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

Published on: July 8, 2021

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在没有磁共振模式的情况下,高过渡温度超导.

J Hwang1, T Timusk, G D Gu

  • 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.

Nature
|February 20, 2004
PubMed
概括
此摘要是机器生成的。

研究人员研究了铜氧化物中高过渡温度 (高T) 超导性. 他们发现,以前与磁共振或声子相关的尖光谱特征在关键的兴奋剂水平上消失,排除它们是高T (c) 超导的原因.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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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
  • 量子材料 量子材料是一种量子材料.

背景情况:

  • 铜氧化物中高过渡温度 (高T) 超导性背后的机制仍然是一个重要的科学辩论.
  • 作为配对机制的标志性特征,电子运动能光谱中的尖"扭曲"已被提出,并提出与磁共振和声子的联系.

研究的目的:

  • 调查在高T (c) 超导体中观察到的尖光谱特征的起源.
  • 为了确定这种特征,电子-玻色子合和铜氧化物中的超导状态之间的关系.

主要方法:

  • 红外光谱学被用来分析Bi2Sr2CaCu2O8+delta (Bi-2212) 单晶的电子特性.
  • 该研究的重点是将一个尖的光谱特征从广泛的背景中分离出来,并观察其行为作为兴奋剂度的函数.

主要成果:

  • 这种尖的光谱特征成功地从红外光谱中的广泛背景中分离出来.
  • 这种尖的特征随着兴奋剂的增加而减弱,在每铜原子0.23个孔的临界兴奋剂水平时完全消失.
  • 在这个关键的兴奋剂水平上,超导性仍然很强,过渡温度 (T ((c)) 约为55K.

结论:

  • 在超导率仍然很强的兴奋剂水平上,尖特征的消失排除了磁共振和声子作为高T (c) 超导率的主要原因.
  • 广泛的背景,铜氧平面的普遍特征,被提出为电子结合""的更可能的候选人,负责高T (c) 超导.