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 , TA(1) along , and TA(2) along [1 (1) over bar0]) and two low-energy optic phonon modes (LO and TO1) have been mapped out between 300 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 T-N = 640 K. This suggests that the magnetic order and low-energy lattice dynamics in this multiferroic material are coupled.
|Number of pages||5|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 10 Feb 2015|
- BISMUTH FERRITE