Observation of surface ferromagnons in the axion-insulating phase of the antiferromagnetic topological insulator EuSn2As2
- We report the study of spin dynamics of Eu2+ in the antiferromagnetic axion topological insulator EuSn2As2 by means of antiferromagnetic resonance at 9.34 GHz. Below the Néel temperature (TN), two types of resonance modes, the conventional bulk antiferromagnetic resonance and additional surface ferromagnetic resonance, are observed. The latter turns out to be characteristic of the axion-insulating phase. Above TN, we prove the existence of a Kosterlitz-Thouless scenario that is relevant for the spin relaxation in the Eu2+ layers. The absence of Korringa relaxation indicates the strong confinement of the conduction electrons at the Fermi level to the SnAs layers.
| Author: | Mamoun HemmidaORCiD, Santanu Pakhira, David C. Johnston, Hans-Albrecht Krug von NiddaORCiDGND |
|---|---|
| URN: | urn:nbn:de:bvb:384-opus4-1316308 |
| Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/131630 |
| ISSN: | 2643-1564OPAC |
| Parent Title (English): | Physical Review Research |
| Publisher: | American Physical Society |
| Place of publication: | College Park, MD |
| Type: | Article |
| Language: | English |
| Date of Publication (online): | 2026/07/01 |
| Year of first Publication: | 2026 |
| Publishing Institution: | Universität Augsburg |
| Release Date: | 2026/07/02 |
| Volume: | 8 |
| Issue: | 2 |
| First Page: | 023309 |
| DOI: | https://doi.org/10.1103/dp4g-dyll |
| Institutes: | Mathematisch-Naturwissenschaftlich-Technische Fakultät |
| Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik | |
| Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik V | |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Licence (German): |  CC-BY 4.0: Creative Commons: Namensnennung |
