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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

960
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...
960
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
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.1K
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...
1.1K
Colors and Magnetism03:02

Colors and Magnetism

11.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.9K

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Insight into interplay between bandstructure and Coulomb interaction via quasiparticle interference.

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Semimetallic spin-density wave state in iron pnictides.

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Coupled spin-orbital fluctuations in a three orbital model for 4<i>d</i>and 5<i>d</i>oxides with electron fillings<i>n</i><b>=</b>3, 4, 5-application to NaOsO<sub>3</sub>, Ca<sub>2</sub>RuO<sub>4</sub>and Sr<sub>2</sub>IrO<sub>4</sub>.

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Related Experiment Video

Updated: Jul 23, 2025

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

Published on: April 12, 2019

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Spin-orbit coupling and magnetism inSr2CrO4.

Shubhajyoti Mohapatra1, Dheeraj Kumar Singh2, Avinash Singh3

  • 1Saha Institute of Nuclear Physics, Theory Division, Kolkata 700064, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 18, 2023
PubMed
Summary
This summary is machine-generated.

Strontium chromate (Sr2CrO4) shows active orbital degrees of freedom, leading to strong spin-orbital correlations. Orbital fluctuations reduce these correlations and magnon energies, aligning with experimental findings.

Keywords:
Coulomb interactioncrystal fieldmagnonorbitonspin–orbit couplingstrontium chromate

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum magnetism

Background:

  • Sr2CrO4 is a 3d transition metal compound with an active orbital degree of freedom.
  • The interplay between orbital, spin, and lattice degrees of freedom is crucial in such materials.
  • Understanding spin-orbit coupling (SOC) renormalization is key to predicting material properties.

Purpose of the Study:

  • Investigate the role of orbital fluctuations in Sr2CrO4.
  • Quantify the impact of Coulomb interactions on spin-orbit coupling.
  • Correlate theoretical predictions with experimental observations of transition temperatures.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Mean-field theory for orbital fluctuations.
  • Calculation of orbiton and magnon excitation energies.
  • Comparison with experimental susceptibility and resistivity data.

Main Results:

  • Coulomb interactions renormalize the weak bare spin-orbit coupling (SOC), enhancing orbital and spin-orbital correlations.
  • Finite temperature orbital fluctuations significantly reduce spin-orbital correlations, effective SOC, and magnon excitation energy.
  • Calculated transition temperatures for orbital and magnetic ordering agree well with experimental data.

Conclusions:

  • Orbital fluctuations play a critical role in the magnetic and orbital properties of Sr2CrO4.
  • The theoretical model successfully captures the essential physics governing the material's behavior.
  • Results provide insights into the complex correlations in 3d transition metal compounds.