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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,...
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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 Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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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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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Superconducting Valve Exploiting Interplay between Spin-Orbit and Exchange Interactions.

Alexey Neilo1, Sergey Bakurskiy1,2, Nikolay Klenov1

  • 1National University of Science and Technology MISIS, 119049 Moscow, Russia.

Nanomaterials (Basel, Switzerland)
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This summary is machine-generated.

Spin-orbit interaction in superconductor-normal metal-ferromagnetic structures enhances critical temperature. These SNSOF structures act as spin valves, offering advantages over traditional devices for superconducting electronics.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Superconductivity

Background:

  • Proximity effect in superconductor-ferromagnetic (SF) structures is crucial for superconducting electronics.
  • Spin-orbit interaction (SOI) in normal metal layers can influence magnetic and superconducting properties.

Purpose of the Study:

  • To theoretically investigate the proximity effect in superconductor-normal metal-ferromagnetic-superconductor (SNSOF) and SF'F structures.
  • To analyze the role of spin-orbit interaction (SOI) in the normal metal layer on triplet correlations and critical temperature.
  • To evaluate SNSOF structures as potential spin valves for superconducting electronics.

Main Methods:

  • Theoretical investigation of SNSOF and SF'F multilayer structures.
  • Analysis of spin-orbit interaction (including Rashba and Dresselhaus components) in the normal metal layer.
  • Calculation of critical temperature and control characteristics of the spin valve structures.

Main Results:

  • A normal layer with SOI effectively suppresses triplet correlations in the ferromagnetic layer.
  • The critical temperature of the superconducting layer in SNSOF structures is higher compared to those without SOI.
  • SNSOF structures with mixed SOI exhibit spin valve behavior, with critical temperature dependent on magnetization direction.

Conclusions:

  • SNSOF structures with SOI offer enhanced critical temperatures and spin valve functionality.
  • These structures present significant advantages over traditional SF'F spin valves.
  • SNSOF structures are promising for developing high-performance storage components in superconducting electronics.