High-resolution polarised Raman scattering study on spin-phonon coupling in multiferroic MnWO4
2015 | journal article. A publication with affiliation to the University of Göttingen.
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High-resolution polarised Raman scattering study on spin-phonon coupling in multiferroic MnWO4
Ziegler, F.; Gibhardt, H.; Leist, J. & Eckold, G. (2015)
Materials Research Express, 2(9) art. 096103. DOI: https://doi.org/10.1088/2053-1591/2/9/096103
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Details
- Authors
- Ziegler, Fabian; Gibhardt, Holger; Leist, Jeannis; Eckold, Götz
- Abstract
- MnWO4 passes three antiferromagnetic phase transitions below the Neel temperature T-N = 13.5 K. One of these phases is also ferroelectric and MnWO4 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 wave numbers 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 line widths are unaffected by the magnetic phase transitions and continuously increase with temperature as expected for three-phonon decay processes.
- Issue Date
- 2015
- Status
- published
- Publisher
- IOP Publishing
- Journal
- Materials Research Express
- eISSN
- 2053-1591
- ISSN
- 2053-1591
- Language
- English