Phonon softening and atomic modulations in ${\mathrm{EuAl}}_{4}$

Simple item page
dc.citation.articleNumber45102en_US
dc.citation.issueNumber4en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber110en_US
dc.contributor.authorKorshunov, A. N.en_US
dc.contributor.authorSukhanov, A. S.en_US
dc.contributor.authorGebel, S.en_US
dc.contributor.authorPavlovskii, M. S.en_US
dc.contributor.authorAndriushin, N. D.en_US
dc.contributor.authorGao, Y.en_US
dc.contributor.authorMoya, J. M.en_US
dc.contributor.authorMorosan, E.en_US
dc.contributor.authorRahn, M. C.en_US
dc.date.accessioned2024-08-29T21:11:44Zen_US
dc.date.available2024-08-29T21:11:44Zen_US
dc.date.issued2024en_US
dc.description.abstractEuAl4 is a rare-earth intermetallic in which competing itinerant and/or indirect exchange mechanisms give rise to a complex magnetic phase diagram, including a centrosymmetric skyrmion lattice. These phenomena arise not in the tetragonal parent structure but in the presence of a charge-density wave (CDW), which lowers the crystal symmetry and renormalizes the electronic structure. Microscopic knowledge of the corresponding atomic modulations and their driving mechanism is a prerequisite for a deeper understanding of the resulting equilibrium of electronic correlations and how it might be manipulated. Here, we use synchrotron single-crystal x-ray diffraction, inelastic x-ray scattering, and lattice-dynamics calculations to clarify the origin of the CDW in EuAl4. We observe a broad softening of a transverse acoustic phonon mode that sets in well above room temperature and, at 𝑇CDW=142 K, freezes out in an atomic displacement mode described by the superspace group 𝐼⁢𝑚⁡𝑚⁡𝑚⁡(00⁢𝛾)⁢𝑠⁢00. In the context of previous work, our observation is a clear confirmation that the CDW in EuAl4 is driven by electron-phonon coupling. This result is relevant for a wider family of BaAl4 and ThCr2⁢Si2-type rare-earth intermetallics known to combine CDW instabilities and complex magnetism.en_US
dc.identifier.citationKorshunov, A. N., Sukhanov, A. S., Gebel, S., Pavlovskii, M. S., Andriushin, N. D., Gao, Y., Moya, J. M., Morosan, E., & Rahn, M. C. (2024). Phonon softening and atomic modulations in ${\mathrm{EuAl}}_{4}$. Physical Review B, 110(4), 045102. https://doi.org/10.1103/PhysRevB.110.045102en_US
dc.identifier.digitalPhysRevB-110-045102en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.110.045102en_US
dc.identifier.urihttps://hdl.handle.net/1911/117722en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license.  Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titlePhonon softening and atomic modulations in ${\mathrm{EuAl}}_{4}$en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
PhysRevB-110-045102.pdf
Size:
1.89 MB
Format:
Adobe Portable Document Format
Download
Collections
Faculty Publications
Physics and Astronomy Publications