Neutron Inelastic Scattering Measurements of Low-Energy Phonons in the Multiferroic BiFeO3

Published

February 10, 2015

Author(s)

John A. Schneeloch, Zhijun Xu, Jinsheng Wen, Peter M. Gehring, Christopher Stock, M. Matsuda, B. Winn, Genda Gu, S. M. Shapiro, R. J. Birgeneau, T. Ushiyama, Y. Yanagisawa, Y. Tomioka, T. Ito, Guangyong Xu

Abstract

We present neutron inelastic scattering measurements of the low-energy phonons in single crystal BiFeO3. The dispersions of the three acoustic phonon modes (LA along [100], TA1 along [010] and TA2 along [1¯10]) and two low energy optic phonon modes (LO and TO1) have been mapped out between 300 K and 700 K. Elastic constants are extracted from the phonon measurements. The energy linewidths of both TA phonons at the zone boundary clearly broaden when the system is warmed toward the magnetic ordering temperature TN = 640 K. This suggests that the magnetic and low-energy lattice dynamics in this multiferroic material are coupled.

Citation

Physical Review B

Volume

91

Issue

6

Pub Type

Journals

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Keywords

Multiferroic, BiFeO3, Lattice dynamics, phonon damping, phonon coupling, neutron scattering

Citation

Schneeloch, J. , Xu, Z. , Wen, J. , Gehring, P. , Stock, C. , Matsuda, M. , Winn, B. , Gu, G. , Shapiro, S. , Birgeneau, R. , Ushiyama, T. , Yanagisawa, Y. , Tomioka, Y. , Ito, T. and Xu, G. (2015), Neutron Inelastic Scattering Measurements of Low-Energy Phonons in the Multiferroic BiFeO₃, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917564 (Accessed April 23, 2024)