Anharmonic Eigenvectors and Acoustic Phonon Disappearance in Quantum Paraelectric SrTiO3
Journal Article
·
· Physical Review Letters
- Duke Univ., Durham, NC (United States); Duke University
- Indian Inst. of Technology Bombay, Mumbai (India)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Duke Univ., Durham, NC (United States)
Pronounced anomalies in the SrTiO3 dynamical structure factor, S(Q,E), including the disappearance of acoustic phonon branches at low temperatures, were uncovered with inelastic neutron scattering (INS) and simulations. The striking effect reflects anharmonic couplings between acoustic and optic phonons and the incipient ferroelectric instability near the quantum critical point. It is rationalized using a first-principles renormalized anharmonic phonon approach, pointing to nonlinear Ti-O hybridization causing unusual changes in real-space phonon eigenvectors, frequencies, group velocities, and scattering phase space. Lastly, our method is general and establishes how T dependences beyond the harmonic regime, assessed by INS mapping of large reciprocal-space volumes, provide real-space insights into anharmonic atomic dynamics near phase transitions.
- Research Organization:
- Duke Univ., Durham, NC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725; SC0016166; SC0019978
- OSTI ID:
- 1608830
- Alternate ID(s):
- OSTI ID: 1616816
OSTI ID: 1632938
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 124; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Anharmonicity and necessity of phonon eigenvectors in the phonon normal mode analysis
Giant Anharmonic Phonon Scattering in PbTe
Journal Article
·
Thu May 21 00:00:00 EDT 2015
· Journal of Applied Physics
·
OSTI ID:22410227
Giant Anharmonic Phonon Scattering in PbTe
Journal Article
·
Fri Dec 31 23:00:00 EST 2010
· Nature Materials
·
OSTI ID:1018619