Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O3 thin films
dc.contributor | Virginia Tech | en |
dc.contributor.author | Correa, Margarita | en |
dc.contributor.author | Kumar, Amit | en |
dc.contributor.author | Priya, Shashank | en |
dc.contributor.author | Katiyar, Ram S. | en |
dc.contributor.author | Scott, J. F. | en |
dc.contributor.department | Mechanical Engineering | en |
dc.date.accessed | 2013-12-18 | en |
dc.date.accessioned | 2014-02-11T13:46:00Z | en |
dc.date.available | 2014-02-11T13:46:00Z | en |
dc.date.issued | 2011-01-18 | en |
dc.description.abstract | We present Raman data on both single-crystal and thin-film samples of the multiferroic PbFe0.5Nb0.5O3 (PFN). We show first that the number and selection rules of Raman lines are compatible with a face-centered-cubic Fm-3m structure, as is known in other ABO(3) relaxors, such as PbSc1/2Ta1/2O3. We then compare Raman data with anomalies in magnetization and the dielectric constant near the magnetic-phase-transition temperature (T-N), the diffuse ferroelectric-phase-transition temperature (T-m), and the pseudostructural-phase transition temperature (Burns temperature similar to T-B). The temperature evolution of the Raman spectra for the PFN film shows measurable changes in phonon positions, intensities, and full width at half maxima near 200, 410, and 650 K-temperatures that match well with experimentally observed T-N, T-m, and T-B, respectively. The increase in frequency with increasing temperature for the lowest-energy F-2g phonon mode is particularly unexpected. These changes suggest the transition of the crystal structure from an ordered phase to a disordered phase near T-B. The Raman study revealed phonon anomalies in the vicinity of T-m and T-N that are attributed to the dynamical behavior of polar nanoregions and spin-phonon coupling owing to its relaxor and multiferroic nature, respectively, which is well supported by dielectric and magnetic properties of the PFN thin film. Softening of the Fe-O mode was observed near the T-N. We correlate the anomalous shift of the Fe-O mode frequency with the normalized square of the magnetization sublattice; agreement with the experimental results suggests strong spin-phonon coupling near T-N owing to phonon modulation of the superexchange integral; however, the shifts in frequency with temperature are small (<3 cm(-1)). | en |
dc.description.sponsorship | DoD_W911NF-06-1-0183 | en |
dc.description.sponsorship | DoE DE-FG 02-08ER46526 | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.citation | Correa, Margarita ; Kumar, Ashok ; Priya, Shashank ; et al., Jan 18, 2011. "Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O3 thin films," PHYSICAL REVIEW B 83(1): 014302. DOI: 10.1103/PhysRevB.83.014302 | en |
dc.identifier.doi | https://doi.org/10.1103/PhysRevB.83.014302 | en |
dc.identifier.issn | 1098-0121 | en |
dc.identifier.uri | http://hdl.handle.net/10919/25401 | en |
dc.identifier.url | http://link.aps.org/doi/10.1103/PhysRevB.83.014302 | en |
dc.language.iso | en | en |
dc.publisher | American Physical Society | en |
dc.rights | In Copyright | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
dc.subject | ferroelectromagnet pb(fe1/2nb1/2)o-3 | en |
dc.subject | Temperature | en |
dc.subject | Scattering | en |
dc.subject | Ceramics | en |
dc.subject | Spectra | en |
dc.subject | Field | en |
dc.subject | Physics | en |
dc.title | Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O3 thin films | en |
dc.title.serial | Physical Review B | en |
dc.type | Article - Refereed | en |
dc.type.dcmitype | Text | en |
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