Observation of soft phonon mode in by inelastic neutron scattering
Journal Article
·
· Physical Review B
- Federal Research Center, Krasnoyarsk (Russia). Kirensky Institute of Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Technologies Division
In this study, the phonon dispersion in terbium iron borate TbFe3(BO3)4 has been measured by inelastic neutron scattering in a temperature range 180<350 K through the displacive structural transition at TS=192.5 K and studied by ab initio calculations. Significant, but not complete, softening of the transverse acoustic (TA) branch has been observed at the corner of the Brillouin zone (Λ point) at temperatures T≳TS, in full agreement with theoretical calculations. Finally, the TA soft mode undergoes considerable broadening at the Λ point near the transition temperature that can be attributed to the anharmonic interference between transverse acoustic and optical modes.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1422995
- Alternate ID(s):
- OSTI ID: 1423161
- Journal Information:
- Physical Review B, Vol. 97, Issue 5; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 6 works
Citation information provided by
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journal | October 2018 |
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