Thermodynamic modeling of phase separation in manganites

Abstract

We present a phenomenological model based on the thermodynamics of the phase separated state of manganites, accounting for its static and dynamic properties. Through calorimetric measurements on La${}_{0.225}$Pr${}_{0.40}$Ca${}_{0.375}$MnO${}_3$ the low temperature free energies of the coexisting ferromagnetic and charge ordered phases are evaluated. The phase separated state is modeled by free energy densities uniformly spread over the sample volume. The calculations contemplate the out of equilibrium features of the coexisting phase regime, to allow a comparison between magnetic measurements and the predictions of the model. A phase diagram including the static and dynamic properties of the system is constructed, showing the existence of blocked and unblocked regimes which are characteristics of the phase separated state in manganites.

arXiv comment7 pages, 5 figures, Submitted to Phys. Rev. B

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Cited by in corpus (11)

• Magnetocaloric effect in manganites: metamagnetic transitions for magnetic refrigeration
• Electrophoretic-like gating used to control metal-insulator transitions in electronically phase separated manganite wires
• Effect of strain on phase separation and de-vitrification of magnetic glass state in thin films of La5/8-yPryCa3/8MnO3 (y=0.45)
• Equilibrium tuned by a magnetic field in phase separated manganite
• Phase diagram of La_{5/8-y}Nd_{y}Ca_{3/8}MnO_3 manganites
• Coupled magnetic and elastic properties in LaPr(CaSr)MnO manganites
• Suppression of the low-temperature phase-separated state under pressure in (Eu${}_{1-x}$Gd${}_x$)${}_{0.6}$Sr${}_{0.4}$MnO${}_3$ ($x=0,0.1$)
• Thermal cycling effects on static and dynamic properties of a phase separated manganite
• Thermal cycling memory in phase separated manganites
• Avalanche-like metamagnetic transition in (LaNd)CaMnO manganites
• Dynamics of the lattice and spins in the phase-separated manganite (Eu${}_{1-x}$Gd${}_x$)${}_{0.6}$Sr${}_{0.4}$MnO${}_3$