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Related Concept Videos

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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
819
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.6K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.6K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

711
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.
711
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
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Mutual spin-phonon driving effects and phonon eigenvector renormalization in nickel (II) oxide.

Qiyang Sun1, Bin Wei1,2, Yaokun Su3

  • 1Department of Mechanical Engineering, University of California, Riverside, CA 92521.

Proceedings of the National Academy of Sciences of the United States of America
|July 20, 2022
PubMed
Summary

Spin-phonon coupling influences acoustic phonon properties, revealing strong spin-lattice correlations in nickel oxide. This interaction affects spin and heat transport, with implications for novel electronic devices.

Keywords:
anomalous inelastic neutron scattering intensityphonon dynamicsphonon eigenvector renormalizationspin-phonon coupling

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Spin-phonon coupling is crucial for spin and heat transport phenomena.
  • The impact of spin-phonon coupling on acoustic phonon properties remains largely unexplored.
  • Understanding these interactions is key to developing advanced electronic materials.

Purpose of the Study:

  • To investigate the elusive effect of spin-phonon coupling on acoustic phonon properties.
  • To identify and characterize spin-lattice correlations in magnetic materials.
  • To elucidate the mechanisms behind anomalous phonon behavior in antiferromagnets.

Main Methods:

  • Inelastic neutron scattering experiments were performed on nickel (II) oxide.
  • First-principles calculations were employed to model the observed phenomena.
  • Analysis focused on scattering spectral intensity and its dependence on momentum transfer and temperature.

Main Results:

  • Anomalous scattering spectral intensity from acoustic phonons was observed in nickel (II) oxide.
  • Strong spin-lattice correlations were identified, renormalizing acoustic phonon polarization.
  • A magnetic scattering signature was detected, indicating spin precession driven by phonons.
  • "Geometry-forbidden" scattering from transverse acoustic phonons suggests eigenvector renormalization.

Conclusions:

  • The study demonstrates significant spin-phonon coupling affecting acoustic phonon dynamics.
  • Observed phenomena are attributed to the coupling between phonons and local ionic magnetization, not magnetostriction.
  • Findings provide new insights into spin-lattice interactions and their role in material properties.