| Autor: |
Fabian Ziegler, Holger Gibhardt, Jeannis Leist, Götz Eckold |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Materials Research Express, Vol 2, Iss 9, p 096103 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
2053-1591 |
| DOI: |
10.1088/2053-1591/2/9/096103 |
| Popis: |
MnWO _4 passes three antiferromagnetic phase transitions below the Néel temperature T _N = 13.5 K. One of these phases is also ferroelectric and MnWO _4 is therefore referred to as multiferroic. We investigated the effect of magnetic and electric ordering on the lattice dynamics by high-resolution polarized Raman spectroscopy. With an accuracy of about 0.02 cm ^−1 , anomalous shifts of nearly all Raman-active phonon wavenumbers were observed below T _N . High-energy metal–oxygen stretching modes soften on cooling, while low-energy vibrations become harder. Due to their linear temperature dependence, these anomalies can be attributed to a higher-order spin–phonon coupling process. The phonon linewidths are unaffected by the magnetic phase transitions and continuously increase with temperature as expected for three-phonon decay processes. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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