First-principles calculations of phonons and Raman spectra in monoclinic
- Case Western Reserve Univ., Cleveland, OH (United States)
Density functional perturbation theory is used here to calculate the phonons at the zone center for monoclinic CsSnCl3. Furthermore, we report the calculated normal mode frequencies classified according to irreducible representations for both infrared-active and Raman-active modes. We also report the dielectric constants and Born-effective charges and investigate the anisotropy of the nonanalyticities near the zone center. The first-principles calculated Raman-active phonon frequencies and simulated Raman spectra are compared with experimental results from literature. We find that aside from the first-order allowed Raman modes of Ag and Bg symmetries, forbidden LO Raman modes appear prominently in the measured spectra. Several of these modes are close to or coincide with allowed modes and alter their intensity, while others appear as separate otherwise unexplained peaks. With this interpretation, good agreement is obtained with experimental mode frequencies to within a few cm-1.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0008933; ER-46874-SC0008933
- OSTI ID:
- 1593453
- Alternate ID(s):
- OSTI ID: 1179977
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 7; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Phonon order and reststrahlen bands of polar vibrations in crystals with monoclinic symmetry
|
journal | January 2019 |
Phonon order and reststrahlen bands of polar vibrations in crystals with monoclinic symmetry | text | January 2018 |
Similar Records
Vibrational spectra and nonlinear optical coefficients of rhombohedral halide compounds with , Br, Cl
Zone-center phonons in yellow phase