| Title: |
The Magnetoelastic Distortion of Multiferroic BiFeO$_3$ in the Canted Antiferromagnetic State |
| Authors: |
Rõõm, Toomas; Viirok, Johan; Peedu, Laur; Nagel, Urmas; Farkas, Daniel G.; Szaller, David; Kocsis, Vilmos; Bordács, Sandor; Kézsmárki, Istvan; Kamenskyi, Dymtro L.; Engelkamp, Hans; Ozerov, Mike; Smirnov, Dmitry; Krzystek, Jurek; Thirunavukkuarasu, Komalavalli; Ozaki, Yasuko; Tomioka, Yasuhide; Ito, Toshimitsu; Datta, Trinanjan; Fishman, Randy S. |
| Source: |
Phys. Rev. B 102, 214410 (2020) |
| Publication Year: |
2020 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons; Condensed Matter - Materials Science |
| Description: |
Using THz spectroscopy, we show that the spin-wave spectrum of multiferroic BiFeO$_3$ in its high-field canted antiferromagnetic state is well described by a spin model that violates rhombohedral symmetry. We demonstrate that the monoclinic distortion of the canted antiferromagnetic state is induced by the single-ion magnetoelastic coupling between the lattice and the two nearly anti-parallel spins. The revised spin model for BiFeO$_3$ contains two new single-ion anisotropy terms that violate rhombohedral symmetry and depend on the direction of the magnetic field.; Comment: 28 pages (main & supplementary), 2 figures (main article), 15 figures (supplementary material) |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevB.102.214410 |
| Access URL: |
http://arxiv.org/abs/2012.09178 |
| Accession Number: |
edsarx.2012.09178 |
| Database: |
arXiv |