Polar dynamics at the Jahn-Teller transition in ferroelectric GaV4S8
- We present a dielectric spectroscopy study of the polar dynamics linked to the orbitally driven ferroelectric transition in the Skyrmion host GaV4S8. By combining THz and MHz-GHz spectroscopy techniques, we succeed in detecting the relaxational dynamics arising from coupled orbital and polar fluctuations in this material and trace its temperature dependence in the paraelectric as well as in the ferroelectric phase. The relaxation time significantly increases when approaching the critical temperature from both sides of the transition. It is natural to assume that these polar fluctuations map the orbital dynamics at the Jahn-Teller transition. Because of the first-order character of the orbital-ordering transition, the relaxation time shows an enormous jump of about 5 orders of magnitude at the polar and structural phase transition.
| Author: | Zhe Wang, Eugen Ruff, M. Schmidt, Vladimir TsurkanORCiDGND, István KézsmárkiORCiDGND, Peter LunkenheimerORCiDGND, Alois LoidlORCiDGND |
|---|---|
| URN: | urn:nbn:de:bvb:384-opus4-436855 |
| Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/43685 |
| ISSN: | 0031-9007OPAC |
| ISSN: | 1079-7114OPAC |
| Parent Title (English): | Physical Review Letters |
| Publisher: | American Physical Society (APS) |
| Type: | Article |
| Language: | English |
| Year of first Publication: | 2015 |
| Publishing Institution: | Universität Augsburg |
| Release Date: | 2018/11/19 |
| Volume: | 115 |
| Issue: | 20 |
| First Page: | 207601 |
| DOI: | https://doi.org/10.1103/physrevlett.115.207601 |
| 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): |  Deutsches Urheberrecht |
