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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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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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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Color in Coordination Complexes
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Deteriorated Interlayer Coupling in Twisted Bilayer Cobaltites.

Dongke Rong1,2, Xiuqi Chen1,2, Shengru Chen1,2,3

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Nano Letters
|March 31, 2025
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Summary
This summary is machine-generated.

Researchers explored magnetism in van der Waals interfaces by twisting freestanding cobaltites. They found that the Curie temperature decreases with increasing twist angle, offering new ways to control magnetic properties.

Keywords:
freestanding membranesmagnetic couplingmoiré patterntwistronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Magnetic behaviors in oxides arise from Coulomb repulsion and exchange interactions.
  • Research on bonded oxide heterointerfaces is extensive, but van der Waals interfaces remain understudied.
  • Van der Waals heterostructures offer unique platforms for novel electronic and magnetic phenomena.

Purpose of the Study:

  • To investigate magnetism in van der Waals interfaces of cobaltites.
  • To explore the effect of twist angle on magnetic properties.
  • To understand the underlying mechanisms influencing magnetism in twisted systems.

Main Methods:

  • Stacking two freestanding cobaltites with controlled twist angles.
  • Utilizing scanning transmission electron microscopy (STEM) to observe moiré patterns.
  • Measuring Curie temperature in twisted regions and comparing with single-layer regions.

Main Results:

  • Ordered moiré patterns were observed, inversely related to the twist angle.
  • Curie temperature in twisted regions was lower than in single-layer cobaltites.
  • Curie temperature showed a systematic variation with the twist angle.

Conclusions:

  • The observed magnetic modulation is potentially due to weakened orbital hybridization in unbonded interfaces.
  • Twist angle engineering provides a method to tune magnetic interactions in correlated systems.
  • This work opens avenues for discovering novel quantum states in van der Waals magnetic heterostructures.