Microstructure and electrical transport mechanisms of the Ca-doped LaMnO3 films grown on MgO substrate
| Autor: | Kais Daoudi, Tetsuo Tsuchiya, Bashir M. Suleiman, Zied Othmen, S. El-Helali |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Metals and Alloys 02 engineering and technology Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure Polaron 01 natural sciences Variable-range hopping 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnetization symbols.namesake symbols lcsh:TA401-492 Curie temperature lcsh:Materials of engineering and construction. Mechanics of materials Thin film 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Materiomics, Vol 6, Iss 1, Pp 17-23 (2020) |
| ISSN: | 2352-8478 |
| Popis: | La0.7Ca0.3MnO3 (LCMO) thin films have been grown on MgO substrate using the metal organic deposition process. The lattice mismatch between LCMO and MgO is relatively large around 8.14% imposing large in-plane-tensile strain and out-of-plane-compressive strain on the film. Hence the structural, microstructural and electrical properties have been found to be strongly correlated to the strain degree and relaxation. Cross-section transmission electron microscopy observations demonstrate the presence of microstructural defects due to the large lattice mismatch between the LCMO and MgO. In addition to structural and microstructural defects, X-ray diffraction and Raman spectroscopy measurements show the existence of a minor phase of MnO in the film. Magnetization versus temperature measurement show a relatively low Curie temperature around 75 K. The electrical behavior is found to be semiconducting over a large temperature interval. The electrical transport mechanisms have been investigated using the small polaron hopping and variable range hopping models and correlated to their microstructural properties. Keywords: Manganite, Thin film, Epitaxy, Electric transport mechanism |
| Databáze: | OpenAIRE |
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