High-resolution polarised Raman scattering study on spin-phonon coupling in multiferroic MnWO 4
| Autor: | Fabian Ziegler, J Leist, Holger Gibhardt, Götz Eckold |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Phase transition
Materials science Polymers and Plastics Condensed matter physics Phonon Metals and Alloys multiferroics spin-phonon interaction Raman spectroscopy Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials symbols.namesake Condensed Matter::Materials Science symbols Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Spin (physics) Néel temperature Raman scattering |
| Popis: | MnWO4 passes three antiferromagnetic phase transitions below the Néel temperature TN=13.5 K. One of these phases is also ferroelectric andMnWO4 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 TN. 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 unReviewed |
| Databáze: | OpenAIRE |
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