Anharmonic phonons and magnons in BiFeO3
Abstract
The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO3 were measured for temperatures 200 < T < 750K , using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO3 closely resembles that of similar Fe perovskites, such as LaFeO3, despite the cycloid modulation in BiFeO3. We do not find any evidence for a spin gap. A strong T-dependence of the phonon DOS was found, with a marked broadening of the whole spectrum, providing evidence of strong anharmonicity. This anharmonicity is corroborated by large amplitude motions of Bi and O ions observed with neutron diffraction. These results highlight the importance of spin-phonon coupling in this material.
- Authors:
-
- ORNL
- National Institute of Standards and Technology (NIST)
- Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing
- Boston College, Chestnut Hill
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1035536
- DOE Contract Number:
- DE-AC05-00OR22725
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 85; Journal Issue: 6; Journal ID: ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; EXCITATION; MAGNONS; MODULATION; NEUTRON DIFFRACTION; NEUTRONS; PEROVSKITES; PHONONS; SCATTERING; SPIN; multiferroic; phonon; magnon; neutron scattering
Citation Formats
Delaire, Olivier A, Ma, Jie, Stone, Matthew B, Huq, Ashfia, Gout, Delphine J, Brown, Craig, Wang, Kefeng, and Ren, Zhifeng. Anharmonic phonons and magnons in BiFeO3. United States: N. p., 2012.
Web. doi:10.1103/PhysRevB.85.064405.
Delaire, Olivier A, Ma, Jie, Stone, Matthew B, Huq, Ashfia, Gout, Delphine J, Brown, Craig, Wang, Kefeng, & Ren, Zhifeng. Anharmonic phonons and magnons in BiFeO3. United States. https://doi.org/10.1103/PhysRevB.85.064405
Delaire, Olivier A, Ma, Jie, Stone, Matthew B, Huq, Ashfia, Gout, Delphine J, Brown, Craig, Wang, Kefeng, and Ren, Zhifeng. 2012.
"Anharmonic phonons and magnons in BiFeO3". United States. https://doi.org/10.1103/PhysRevB.85.064405.
@article{osti_1035536,
title = {Anharmonic phonons and magnons in BiFeO3},
author = {Delaire, Olivier A and Ma, Jie and Stone, Matthew B and Huq, Ashfia and Gout, Delphine J and Brown, Craig and Wang, Kefeng and Ren, Zhifeng},
abstractNote = {The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO3 were measured for temperatures 200 < T < 750K , using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO3 closely resembles that of similar Fe perovskites, such as LaFeO3, despite the cycloid modulation in BiFeO3. We do not find any evidence for a spin gap. A strong T-dependence of the phonon DOS was found, with a marked broadening of the whole spectrum, providing evidence of strong anharmonicity. This anharmonicity is corroborated by large amplitude motions of Bi and O ions observed with neutron diffraction. These results highlight the importance of spin-phonon coupling in this material.},
doi = {10.1103/PhysRevB.85.064405},
url = {https://www.osti.gov/biblio/1035536},
journal = {Physical Review B},
issn = {1098-0121},
number = 6,
volume = 85,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}
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