Study of phase separation phenomena in half-doped manganites with isovalent substitution of rare-earth cations on example ofSm0.32Pr0.18Sr0.5MnO3
| Autor: | V. V. Runov, A.I. Kurbakov, A. Maignan, Christine Martin, E. O. Bykov, I. I. Larionov, V. A. Ryzhov, V. V. Deriglazov |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Order (ring theory) 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter::Materials Science Crystallography Magnetization Ferromagnetism Phase (matter) 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Orthorhombic crystal system 010306 general physics 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.184424 |
| Popis: | The effect of isovalent substitution of rare-earth cations on the phase separation in half-doped manganites was studied on the example of ${\mathrm{Sm}}_{0.32}{\mathrm{Pr}}_{0.18}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ by high-resolution neutron powder diffraction, neutron beam depolarization, second-harmonic magnetic response, and magnetization and resistivity measurements from 4 K up to room temperature and higher. A structural phase transition from the orthorhombic $Pbnm$ phase to a mixture of $Pbnm$ and monoclinic $P{2}_{1}/m$ phases was observed upon cooling. The magnetic ground state was found to be phase-separated into three magnetic phases emerging at different temperatures, viz., ferromagnetic (FM) and antiferromagnetic A and charge-ordered CE types. FM clusters arise far above room temperature in the orthorhombic phase and coalesce upon cooling to produce the long-range FM order below 250 K and to arrive at the percolative FM phase below 120 K. The A- and CE-type orders form in the monoclinic phase at the temperatures 200 K and 120 K, respectively. The Sm/Pr isovalent substitution qualitatively changes the phase separation and significantly increases its temperature range compared to the parent compounds. The results obtained give us knowledge of phase separation occurring in systems with strong electron correlations and extend opportunities for fine-tuning of their properties. |
| Databáze: | OpenAIRE |
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