High-Pressure Phase Diagram in the Manganites: a Two-site Model Study

Abstract

The pressure dependence of the Curie temperature $T_C$ in manganites, recently studied over a wide pressure range, is not quantitatively accounted for by the quenching of Jahn-Teller distortions, and suggests the occurrence of a new pressure-activated localizing processes. We present a theoretical calculation of $T_C$ based on a two-site double-exchange model with electron-phonon coupling interaction and direct superexchange between the core spins. We calculate the pressure dependence of $T_C$ and compare it with the experimental phase diagram. Our results describe the experimental behavior quite well if a pressure-activated enhancement of the antiferromagnetic superexchange interaction is assumed.

References in corpus (15)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Cellular Dynamical Mean Field Approach to Strongly Correlated Systems
• On the Fermi Liquid to Polaron Crossover II: Double Exchange and the Physics of "Colossal" Magnetoresistance
• Cluster Dynamical Mean-Field Theory of the density-driven Mott transition in the one-dimensional Hubbard model
• Dynamical Properties of small Polarons
• Pressure-tuning of the electron-phonon coupling: the insulator to metal transition in manganites
• Pressure effects on charge, spin, and metal-insulator transitions in narrow bandwidth manganite Pr${}_{1-x}$Ca${}_x$MnO${}_3$
• Joint superexchange--Jahn-Teller mechanism for A-type antiferromagnetism in $LaMn{O}_3$
• Effects of Pressure on Electron Transport and Local Structure of Manganites: Low to High Pressure Regime
• Transport and structural study of pressure-induced magnetic states in Nd0.55Sr0.45MnO3 and Nd0.5Sr0.5MnO3
• Electronic and phononic states of the Holstein-Hubbard dimer of variable length
• Pressure Induced Reentrant Electronic and Magnetic State in Pr0.7Ca0.3MnO3 Manganite
• Stabilization of A-type layered antiferromagnetic phase in LaMnO_3 by cooperative Jahn-Teller deformations
• Interplay between Spin and Phonon Fluctuations in the double-exchange model for the manganites
• Polaronic Heat Capacity in The Anderson - Hasegawa Model

Cited by in corpus (3)

• Pressure induced magnetic phase separation in La${}_{0.75}$Ca${}_{0.25}$MnO${}_3$ manganite
• High pressure Raman study of La${}_{1-x}$Ca${}_x$MnO${}_{3-\delta }$ manganites
• A phenomenological model for the pressure sensitivity of the Curie temperature in hole-doped manganites