Considerations on the quantum double-exchange Hamiltonian

Abstract

Schwinger bosons allow for an advantageous representation of quantum double-exchange. We review this subject, comment on previous results, and address the transition to the semiclassical limit. We derive an effective fermionic Hamiltonian for the spin-dependent hopping of holes interacting with a background of local spins, which is used in a related publication within a two-phase description of colossal magnetoresistant manganites.

7 pages, 3 figures

References in corpus (6)

• Calculation of Densities of States and Spectral Functions by Chebyshev Recursion and Maximum Entropy
• Electronic Hamiltonian for Transition Metal Oxide Compounds
• Optical absorption and single-particle excitations in the 2D Holstein t-J model
• Temperature dependence of the resistivity in the double-exchange model
• Phase diagram of an extended Kondo lattice model for manganites: the Schwinger-boson mean-field approach
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• Doping dependence of spin and orbital correlations in layered manganites
• Green-Function-Based Monte Carlo Method for Classical Fields Coupled to Fermions
• Competition of Zener and polaron phases in doped CMR manganites
• Numerical study of quantum percolation