Raman investigation of Fe-based chalcogenide films
| Autor: | Carlo Camerlingo, Ciro Nappi, E. Bellingeri, E. Sarnelli, C. Ferdeghini |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Condensed matter physics Scattering Chalcogenide 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Light scattering Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake chemistry.chemical_compound chemistry Condensed Matter::Superconductivity 0103 physical sciences symbols Electrical and Electronic Engineering 0210 nano-technology Spectroscopy Raman spectroscopy Raman scattering |
| Zdroj: | Physica B: Condensed Matter. 586:411966 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2019.411966 |
| Popis: | Micro-Raman spectroscopy of FeTe and superconductor Fe(SeTe) films was used to investigate the compression of the lattice which is a typical feature of chalcogenide films. The lattice strain has a strong influence on their electrical, magnetic and superconductor properties. In cases where spin-orbit coupling is non-negligible, an energy split of the 3d orbitals of the Fe atoms that removes the spin energy degeneracy could be generated. This leads to unconventional light scattering mechanisms involving single-magnon excitation. For this reason, we conducted a thorough investigation of FeTe and superconductor Fe(SeTe) films by using visible micro-Raman spectroscopy over a large temperature range. The Raman band at about 1520 cm−1 featured by the FeSe0.5Te0.5 films was assigned to the single-magnon scattering, while the Raman response of FeTe films was ascribed to more conventional two-magnon scattering mechanisms. The temperature dependence of the single-magnon Raman scattering was investigated in the temperature range from 15 K to 295 K, enabling information to be obtained on the influence of spin fluctuations on the magnetic order. |
| Databáze: | OpenAIRE |
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