The role of structural and magnetic inhomogeneities in the formation of magneto-transport properties of the La0.6−Sm Sr0.3Mn1.1O3− ceramics
| Autor: | V. P. Pashchenko, V. V. Burchovetskii, V.А. Тurchenko, Georgiy Levchenko, А.S. Мazur, N.A. Liedienov, V. K. Prokopenko, А.V. Pashchenko, H. Szymczak, V. G. Pitsyuga, V. P. Dyakonov, Yu. F. Revenko |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Valence (chemistry) Materials science Condensed matter physics chemistry.chemical_element 02 engineering and technology Manganese Electron 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Ion NMR spectra database Condensed Matter::Materials Science Magnetization chemistry 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Phase diagram |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 416:457-465 |
| ISSN: | 0304-8853 |
| Popis: | X-ray diffraction, magnetic, transport and SEM measurements were used to investigate the role of structural and magnetic inhomogeneities in the formation of magneto-transport properties of the La0.6−xSmxSr0.3Mn1.1O3−δ (x=0–0.6) ceramics. Reduction of the a parameter of perovskite structure and change of its symmetry are shown to be due to both replacement of La3+ by Sm3+ and an increase concentration of anion and cation vacancies. Broad asymmetric 55Mn NMR spectra are indicative of the high frequency electron double exchange Mn3+↔Mn4+ and demonstrate the heterogeneity of magnetic and valence Mn-states. An excess manganese is dissolved in perovskite structure statistically without formation of planar antiferromagnetic clusters of Mn2+ ions in the deformed A positions. Constructing phase diagram of “composition–structure–properties” describes a strong correlation between structural, resistive and magnetic properties as well as reflects a special role of structural defects in the formation of magneto-transport properties of the rare-earth manganites. |
| Databáze: | OpenAIRE |
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