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 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. 
M. Baldini, L. Capogna, M. Capone, E. Arcangeletti, C. Petrillo, I.   Goncharenko and P. Postorino
cond-mat.str-el