Phase separation in double exchange systems

Abstract

Ferromagnetic systems described by the double exchange model are investigated. At temperatures close to the Curie temperature, and for a wide range of doping levels, the system is unstable toward phase separation. The chemical potential decreases upon increasing doping, due to the significant dependence of the bandwidth on the number of carriers. The reduction of the electronic bandwidth by spin disorder leads to an enormously enhanced thermopower which peaks near T_c, with a sign opposite that predicted by a rigid band model.

4 pages, 2 encapsulated PostScript figures

References in corpus (4)

• Phase Separation in Electronic Models for Manganites
• Charge Localization in Disordered Colossal-Magnetoresistance Manganites
• Monte Carlo Simulations for the Magnetic Phase Diagram of the Double Exchange Hamiltonian
• Anomalous Shift of Chemical Potential in the Double-Exchange Systems

Cited by in corpus (9)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Electronic Phase Separation in Manganite/Insulator Interfaces
• Phase Diagram and Incommensurate Phases in Undoped Manganites
• Ferromagnetic transition in a double-exchange system with alloy disorder
• Dynamics of Holes and Universality Class of the Antiferromagnetic Transition in the Two Dimensional Hubbard Model
• Implications of the Low-Temperature Instability of Dynamical Mean Theory for Double Exchange Systems
• Strongly anharmonic collective modes in a coupled electron-phonon-spin problem
• Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions
• Thermoelectric Power in the Double Exchange Model