Dynamical mean-field study of model double-exchange superlattices
- 19 January 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 73 (4), 041104
- https://doi.org/10.1103/physrevb.73.041104
Abstract
A theoretical study of [001] “double-exchange” superlattices is presented. The superlattice is defined in terms of an perovskite crystal. Itinerant electrons hop among the sites according to a nearest-neighbor tight binding model and are coupled to classical “core spins.” The sites contain ionic charges arranged to form a [001] superlattice that forces a spatial variation of the mobile electron charge on the sites. The double-exchange interaction is treated by the dynamical mean-field approximation, while the long-range Coulomb interaction is taken into account by the Hartree approximation. We find the crucial parameter is the Coulomb screening length. Different types of phases are distinguished and the interfaces between them classified.
Keywords
This publication has 18 references indexed in Scilit:
- Spatial inhomogeneity and strong correlation physics: A dynamical mean-field study of a model Mott-insulator–band-insulator heterostructurePhysical Review B, 2004
- Theory of Mott insulator–band insulator heterostructuresPhysical Review B, 2004
- Electronic reconstruction at an interface between a Mott insulator and a band insulatorNature, 2004
- Perovskite oxide tricolor superlattices with artificially broken inversion symmetry by interface effectsApplied Physics Letters, 2002
- Artificial charge-modulationin atomic-scale perovskite titanate superlatticesNature, 2002
- Giant Electric Field Modulation of Double Exchange Ferromagnetism at Room Temperature in the Perovskite Manganite/TitanateJunctionPhysical Review Letters, 2001
- Metal-insulator transitionsReviews of Modern Physics, 1998
- Magnetoresistance of the Double-Exchange Model in Infinite DimensionJournal of the Physics Society Japan, 1995
- Superexchange interaction and symmetry properties of electron orbitalsJournal of Physics and Chemistry of Solids, 1959
- Interaction between the-Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite StructurePhysical Review B, 1951