Pressure induced magnetic phase separation in La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ manganite
| Autor: | Baldini, M., Capogna, L., Capone, M., Arcangeletti, E., Petrillo, C., Goncharenko, I., Postorino, P. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 24 045601 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/24/4/045601 |
| Popis: | The pressure dependence of the Curie temperature T$_{C}(P)$ in La$_{0.75}$Ca$_{0.25}$MnO$_{3}$ was determined by neutron diffraction up to 8 GPa, and compared with the metallization temperature T$_{IM}(P)$ \cite{irprl}. The behavior of the two temperatures appears similar over the whole pressure range suggesting a key role of magnetic double exchange also in the pressure regime where the superexchange interaction is dominant. Coexistence of antiferromagnetic and ferromagnetic peaks at high pressure and low temperature indicates a phase separated regime which is well reproduced with a dynamical mean-field calculation for a simplified model. A new P-T phase diagram has been proposed on the basis of the whole set of experimental data. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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