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Related Concept Videos

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

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

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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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.3K
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,...
1.3K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.3K
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...
1.3K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.8K
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...
2.8K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.5K
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...
1.5K
Valence Bond Theory02:42

Valence Bond Theory

10.8K
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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin-phonon coupling in epitaxial SrRuO3 heterostructures.

Seung Gyo Jeong1, Soo Yeon Lim, Jiwoong Kim

  • 1Department of Physics, Sungkyunkwan University, Suwon 16419, Korea. choiws@skku.edu.

Nanoscale
|July 2, 2020
PubMed
Summary

Spin-phonon coupling in strontium ruthenium oxide (SrRuO3) was identified using Raman spectroscopy. Reducing SrRuO3 dimensions influences its magnetic and phonon properties, enabling tailored spintronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin-phonon coupling is crucial for understanding magnetic properties in functional materials.
  • Ferromagnetic strontium ruthenium oxide (SrRuO3) is a correlated metal with potential for spintronic devices.
  • Studying spin-phonon interactions in SrRuO3 is key to unlocking its technological applications.

Purpose of the Study:

  • To identify and characterize spin-phonon coupling in SrRuO3 heterostructures.
  • To investigate the influence of reduced dimensionality on magnetic and phonon properties of SrRuO3.
  • To demonstrate the tunability of phonon dynamics via epitaxial heterostructuring.

Main Methods:

  • Fabrication of epitaxial oxide superlattices with 50 repetitions of quasi-2D SrRuO3 layers.
  • Raman spectroscopy to probe phonon spectra and identify spin-phonon coupling.
  • Temperature-dependent magnetization measurements to assess magnetic properties.

Main Results:

  • Spin-phonon coupling was clearly identified in SrRuO3 heterostructures.
  • Reducing system dimensions coherently affected both magnetization and phonon spectra.
  • Phonon dynamics were found to be strongly influenced by spin ordering in SrRuO3.

Conclusions:

  • Atomically controlled epitaxial heterostructuring allows for efficient tailoring of spin-phonon interactions in SrRuO3.
  • The findings provide a pathway for designing novel spintronic devices based on SrRuO3.
  • This study highlights the significant role of phonon dynamics in the magnetic ground states of functional materials.