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Anharmonic phonons and magnons in BiFeO 3

Publication ,  Journal Article
Delaire, O; Stone, MB; Ma, J; Huq, A; Gout, D; Brown, C; Wang, KF; Ren, ZF
Published in: Physical Review B - Condensed Matter and Materials Physics
February 13, 2012

The phonon density of states (DOS) and magnetic excitation spectrum of polycrystalline BiFeO 3 were measured for temperatures 200≤T≤750K, using inelastic neutron scattering (INS). Our results indicate that the magnetic spectrum of BiFeO 3 closely resembles that of similar Fe perovskites, such as LaFeO 3, despite the cycloid modulation in BiFeO 3. 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. A clear anomaly is seen in the T dependence of Bi-dominated modes across the Néel transition. These results highlight the importance of spin-phonon coupling in this material. © 2012 American Physical Society.

Duke Scholars

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

February 13, 2012

Volume

85

Issue

6

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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ICMJE
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Delaire, O., Stone, M. B., Ma, J., Huq, A., Gout, D., Brown, C., … Ren, Z. F. (2012). Anharmonic phonons and magnons in BiFeO 3. Physical Review B - Condensed Matter and Materials Physics, 85(6). https://doi.org/10.1103/PhysRevB.85.064405
Delaire, O., M. B. Stone, J. Ma, A. Huq, D. Gout, C. Brown, K. F. Wang, and Z. F. Ren. “Anharmonic phonons and magnons in BiFeO 3.” Physical Review B - Condensed Matter and Materials Physics 85, no. 6 (February 13, 2012). https://doi.org/10.1103/PhysRevB.85.064405.
Delaire O, Stone MB, Ma J, Huq A, Gout D, Brown C, et al. Anharmonic phonons and magnons in BiFeO 3. Physical Review B - Condensed Matter and Materials Physics. 2012 Feb 13;85(6).
Delaire, O., et al. “Anharmonic phonons and magnons in BiFeO 3.” Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 6, Feb. 2012. Scopus, doi:10.1103/PhysRevB.85.064405.
Delaire O, Stone MB, Ma J, Huq A, Gout D, Brown C, Wang KF, Ren ZF. Anharmonic phonons and magnons in BiFeO 3. Physical Review B - Condensed Matter and Materials Physics. 2012 Feb 13;85(6).

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

February 13, 2012

Volume

85

Issue

6

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences