Article: Role of Laser Excitation Wavelength and Power in the Fano Resonance Scattering in RFe₀.₅₀Cr₀.₅₀O₃ (R = Sm, Er, and Eu): A Brief Raman Study
Journal of physical chemistry. 2022 Mar. 15, v. 126, no. 12
2022
Abstract: Here in the present report, we have extensively studied the impact of the excitation laser wavelength and laser power on the Raman spectrum of mixed Fe-Cr-based rare-earth perovskites. Resonant and excitation laser power experiments carried out for these ...
| Abstract | Here in the present report, we have extensively studied the impact of the excitation laser wavelength and laser power on the Raman spectrum of mixed Fe-Cr-based rare-earth perovskites. Resonant and excitation laser power experiments carried out for these samples suggest the orbital-mediated lattice rearrangement because of electronic excitation from Cr³⁺(d³)-O²–-Fe³⁺(d⁵) ions, which results in an antiresonance dip around 600 cm–¹. The presence of an antiresonance dip even at low laser power is ascribed to Fano interference between the electronic continuum and phonons. Furthermore, with increasing the laser power, the Raman modes show a systematic red shift and asymmetrically broadened Raman lines, which is understood in terms of laser-induced heating effects. Consequently, it also upraises a question about the intrinsic nature of Fano resonance observed for a sample, because it may have laser-induced origin too. Therefore, the present study provides an important outcome emphasizing the high sensitivity of Raman measurements, wherein the laser power of the incident photons plays a major role such that it can even perturb the original features of samples. |
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| Keywords | physical chemistry ; rare earth elements ; wavelengths |
| Language | English |
| Dates of publication | 2022-0315 |
| Size | p. 5403-5410. |
| Publishing place | American Chemical Society |
| Document type | Article |
| ISSN | 1932-7455 |
| DOI | 10.1021/acs.jpcc.1c09537 |
| Database | NAL-Catalogue (AGRICOLA) |
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