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相关概念视频

The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.6K
Types Of Superconductors01:28

Types Of Superconductors

1.9K
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...
2.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

2.0K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Molecular Orbital Theory II03:51

Molecular Orbital Theory II

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Molecular Orbital Energy Diagrams
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相关实验视频

Updated: Apr 12, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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没有超导性的电子配对.

Guanglei Cheng1, Michelle Tomczyk1, Shicheng Lu1

  • 11] Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA [2] Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.

Nature
|May 15, 2015
PubMed
概括
此摘要是机器生成的。

研究人员在酸 (SrTiO3) 中发现了一种新的电子相,电子在没有超导性的情况下配对. 这一发现为非传统的电子配对机制和超导的前体提供了新的见解.

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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
  • 超导电性 超导电性 超导电性

背景情况:

  • 酸 (SrTiO3) 是一种超导半导体,具有独特的相位图,暗示了非常规的电子配对.
  • 了解SrTiO3中电子配对的机制是50年来一直存在的长期挑战.

研究的目的:

  • 实验性地研究 SrTiO3.3 中电子配对的性质.
  • 探索这种材料中电子配对和超导性之间的关系.

主要方法:

  • 在SrTiO3/LaAlO3接口上使用基于纳米线的单电子晶体管进行运输实验.
  • 静电门探测电子状态及其对磁场的反应.

主要成果:

  • 观察到的两电子导电共振 (对电子状态) 稳定高达900mK.
  • 证明了电子配对在一个临界场 (Bp ≈ 1-4 T) 上方分叉,与超导临界场不同.
  • 展示了配对状态的取决于场的行为,与Bp以上的线性齐曼式分割.

结论:

  • 一个强大的电子相的存在,其配对的电子先于超导.
  • 这些发现支持了引人注目的哈伯德相互作用驱动实时空间电子配对的模型.
  • 这项工作为超导体中的非传统配对机制提供了重要的实验洞察力.