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Types Of Superconductors01:28

Types Of Superconductors

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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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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.
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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Spin–Spin Coupling: One-Bond Coupling01:17

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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,...
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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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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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Type-II Ising Superconductivity in Two-Dimensional Materials with Spin-Orbit Coupling.

Chong Wang1,2,3,4, Biao Lian5, Xiaomi Guo2,3

  • 1Institute for Advanced Study, Tsinghua University, Beijing 100084, China.

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|October 22, 2019
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Summary
This summary is machine-generated.

Centrosymmetric materials can exhibit Ising superconductivity due to spin-orbit coupling, creating novel electronic states. This discovery expands the possibilities for spintronics and 2D materials research.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Centrosymmetric materials with spin-degenerate bands are typically considered trivial for spintronics.
  • Understanding novel electronic states in two-dimensional (2D) materials is crucial for advanced applications.

Purpose of the Study:

  • To investigate the potential of centrosymmetric 2D materials for spintronics and superconductivity.
  • To explore the effects of spin-orbit coupling in materials with multiple degenerate orbitals.

Main Methods:

  • High-throughput first-principles calculations were employed.
  • Analysis of spin-orbit coupling effects on electronic band structures.

Main Results:

  • Spin-orbit coupling induces spin-orbital locking in 2D materials.
  • Out-of-plane Zeeman-like fields and novel electronic states insensitive to in-plane magnetic fields were generated.
  • A new type of Ising superconductivity applicable to centrosymmetric materials was identified.

Conclusions:

  • The findings enrich the physics and materials science of Ising superconductivity.
  • This research opens new avenues for exploring 2D materials in spintronics and superconductivity.
  • Novel electronic states in centrosymmetric materials offer new opportunities for technological advancements.