Related Experiment Video
Updated: Jan 18, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.9K
Strong Magnon-Phonon Coupling in the Kagome Antiferromagnets
A S Sukhanov1, O I Utesov2, A N Korshunov3
1University of Augsburg, Experimental Physics VI, Center for Electronic Correlations and Magnetism, 86159 Augsburg, Germany.
Physical Review Letters
|September 10, 2025
Summary
We observed strong magnon-phonon coupling in Mn3Ge, a kagome antiferromagnet, revealing hybridization between spin fluctuations and optical phonons. This finding is key for developing new spintronic and quantum materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Magnon-phonon hybridization is vital for spintronics, magnonics, and quantum materials.
- Understanding this coupling in ordered materials is crucial for technological advancements.
Purpose of the Study:
- To investigate and provide experimental evidence of magnon-phonon coupling in Mn3Ge.
- To elucidate the mechanisms driving this interaction in a kagome antiferromagnet.
Main Methods:
- Inelastic X-ray Scattering (IXS) was employed for experimental analysis.
- Ab initio modeling was used for theoretical insights and validation.
- Studied Mn3Ge, a kagome antiferromagnet with noncollinear spin order.
Main Results:
- Direct experimental evidence of strong magnon-phonon hybridization was found.
- A significant hybridization gap of approximately 2 meV was observed.
- Identified planar spin fluctuations coupling with transverse optical phonons.
Conclusions:
- Mn3Ge serves as an excellent model system for studying magnon-phonon interactions.
- The observed coupling is driven by interlayer Heisenberg exchange, enhanced by symmetry and frustration.
- Findings pave the way for designing materials with tunable magnetoelastic properties.
Related Concept Videos
01:31Ferromagnetism
3.0K
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...
3.0K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.0K
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...
3.0K
01:17Spin–Spin Coupling: One-Bond Coupling
1.4K
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,...
1.4K
01:08Spin–Spin Coupling Constant: Overview
1.5K
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...
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...
1.5K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.6K
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...
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...
1.6K
01:26Diamagnetism
2.9K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.9K