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EnglishThe pressure dependence of the Curie temperature T-C(P) in La0.75Ca0.25MnO3 was determined by neutron diffraction up to 8 GPa, and compared with the metallization temperature T-IM(P) (Postorino et al 2003 Phys. Rev. Lett. 91 175501). 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. The 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. RI Capone, Massimo/A-7762-2008
| Titolo: | Pressure induced magnetic phase separation in La0.75Ca0.25MnO3 manganite |
| Autori: | Baldini, M; Capogna, L; Capone, M; Arcangeletti, E; Petrillo, C; Goncharenko, I; Postorino, P |
| Rivista: | |
| Data di pubblicazione: | 2012 |
| Volume: | 24 |
| Fascicolo: | 4 |
| Pagina iniziale: | 1 |
| Pagina finale: | 5 |
| Numero di Articolo: | 045601 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/0953-8984/24/4/045601 |
| URL: | https://arxiv.org/abs/1112.1927 |
| Appare nelle tipologie: | 1.1 Journal article |
