Raman studies of spin-phonon coupling in hexagonal BaFe12O19
| Autor: | Beongki Cho, In Sang Yang, N. H. Sung, Jung Chul Sur, Nguyen Thi Minh Hien, Xiang Bai Chen, Kiok Han |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Condensed matter physics Phonon General Physics and Astronomy Soft modes Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Magnetic field Condensed Matter::Materials Science symbols.namesake Magnetization Condensed Matter::Superconductivity symbols Condensed Matter::Strongly Correlated Electrons Raman spectroscopy Spin (physics) Softening Single crystal |
| Zdroj: | Journal of Applied Physics. 114:013912 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.4812575 |
| Popis: | Phonon softening in hexagonal BaFe12O19 single crystal is observed in temperature dependent polarized Raman spectroscopy. The phonon softening is significantly enhanced below ∼80 K, at which the magnetization in a magnetic field along c-axis shows a clear change in the temperature dependence, indicating a magnetic phase transition near 80 K. Possible interpretations of the anomalous temperature dependence of the phonon frequencies–phonon softening behaviors are discussed. The phonon softening would be correlated to local structural and magnetic phase transition in hexagonal BaFe12O19, in which the spin-phonon coupling would have major contribution for the phonon softening. We also discuss that the spin-phonon coupling would be affected by both the spin ordering and the individual phonon vibration in magnetic material. |
| Databáze: | OpenAIRE |
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