ISIS Neutron and Muon Source Data Journal

Search for magnon-phonon coupling effect in metallic triangular antiferromagnet CrB2

Abstract: Spin dynamics of non-collinear magnetic structures can exhibit the rare phenomena which go beyond the linear spin wave theory. Our previous studies on non-collinear antiferromagnetic insulators (Y, Lu)MnO3 at ISIS showed that magnon-magnon/phonon interactions indeed have a sizable effect on the spin dynamics. To extend this concept to metallic systems, we have recently carried out an inelastic neutron scattering experiment at MAPS on CrB2, a metallic triangular antiferromagnet with non-collinear magnetic structure. Along with successful measurements of magnons over a large momentum-energy space, we observed that some phonon modes near the magnon modes have unusual behavior, which is also seen in (Y, Lu)MnO3. To confirm that this anomaly comes from magnon-phonon coupling, we propose to investigate the phonon spectra of CrB2 at 150 K, the temperature above TN =88 K where magnons disappear.

Principal Investigator: Professor Je-Geun Park
Experimenter: Mr Taehun Kim
Experimenter: Professor Michel Kenzelmann
Experimenter: Mr KISOO PARK
Experimenter: Dr Pyeongjae Park
Local Contact: Dr Toby Perring
Experimenter: Professor Jun Akimitsu
Experimenter: Dr Yusuke Kosaka
Experimenter: Mr heejun yang
Experimenter: Mr chaebin kim

DOI: 10.5286/ISIS.E.RB1920370

ISIS Experiment Number: RB1920370

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Professor Je-Geun Park et al; (2019): Search for magnon-phonon coupling effect in metallic triangular antiferromagnet CrB2, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1920370

Data is released under the CC-BY-4.0 license.