Role of the superexchange interaction in magnetic transition and polaron crossover
Abstract
The Hubbard-Holstein model is studied including double-exchange interaction and superexchange interaction using a variational phonon basis obtained through the modified Lang-Firsov (MLF) transformation followed by the squeezing transformation. The kinetic energy, polaron crossover and magnetic transition are investigated as a function of electron-phonon (e-ph) coupling and electron concentration for different values of antiferromagnetic superexchange interaction (J) between the core spins. The polaron crossover, magnetic transition and the suppression of ferromagnetic transition with J are discussed for the model.
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