Magnetic phase transitions in Ln 1–x Sr x Co0.5Mn0.5O3 (Ln = La, Pr, Nd, and Eu)
| Autor: | M. V. Bushinskii, V. M. Dobryanskii, O. S. Mantytskaya, I. O. Troyanchuk, N. V. Tereshko, A. N. Chobot, V. V. Sikolenko, E. A. Efimova |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Condensed matter physics Neutron diffraction 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Ion Condensed Matter::Materials Science Magnetization Crystallography Ferromagnetism Superexchange 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Monoclinic crystal system Bar (unit) Solid solution |
| Zdroj: | Physics of the Solid State. 59:728-732 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783417040291 |
| Popis: | The system of La1–xSrxCo0.5Mn0.5O3 solid solutions have been studied by neutron diffraction and the measurement of the magnetization. The composition with x = 0 has the monoclinic structure (space group P21/n); the compositions with 0.15 ≤ x ≤ 0.6 are rhombohedral (R\(\bar 3\)c), and the composition with x = 0.75 is cubic (Pm\(\bar 3\)m). All the compositions with x ≤ 0.75 are shown to contain a ferromagnetic component. The stoichiometric composition with x = 0.5 undergoes a sharp ferrromagnet–paramagnet transition at 240 K; however, no coherent magnetic contribution to the neutron diffraction has been detected. The magnetic data are interpreted, assuming that the ferromagnetism at x ≤ 0.15 is due to positive superexchange Co2+–O–Mn4+ interaction, while, at x ≥ 0.25, the superexchange interaction between ions Co3+ in a high-spin state and ions Mn4+ is responsible for the ferromagnetic component. |
| Databáze: | OpenAIRE |
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