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



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


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.
Physical Review B


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


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 BiFeO<sub>3</sub>, Physical Review B, [online], (Accessed June 24, 2024)


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Created February 9, 2015, Updated October 12, 2021