Origin of the mid-infrared peaks in the optical conductivity of LaMnO$_{3}$
| Autor: | Kim Myung-Whun, Purevdorj Munkhbaatar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Infrared Phonon Overtone FOS: Physical sciences 02 engineering and technology Conductivity 01 natural sciences Optical conductivity Molecular physics Condensed Matter - Strongly Correlated Electrons symbols.namesake Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences Materials Chemistry 010306 general physics Orbiton Strongly Correlated Electrons (cond-mat.str-el) General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics symbols Condensed Matter::Strongly Correlated Electrons Astrophysics::Earth and Planetary Astrophysics 0210 nano-technology Raman spectroscopy Raman scattering |
| DOI: | 10.48550/arxiv.2010.00859 |
| Popis: | We calculated the infrared conductivity spectrum of orbitally ordered LaMnO$_3$ in phonon frequency and overtone frequency ranges. We considered orbital exchange, Jahn-Teller electron-phonon coupling, and phonon--phonon coupling. The fundamental excitation of the phonon-coupled orbiton was only Raman active, not infrared active, while its overtone modes were both Raman and infrared active. Our calculations reproduced the small peaks near 1300 cm$^{-1}$ observed both in Raman scattering and infrared conductivity spectra, as consistent with previous experimental results. Comment: 10 pages, 3 figures |
| Databáze: | OpenAIRE |
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