Pressure induced magnetic phase separation in La\(_{0.75}\)Ca\(_{0.25}\)MnO\(_{3}\) manganite

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 pr...

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Veröffentlicht in:arXiv.org 2011-12
Hauptverfasser: Baldini, M, Capogna, L, Capone, M, Arcangeletti, E, Petrillo, C, Goncharenko, I, Postorino, P
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Sprache:eng
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Zusammenfassung: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1112.1927