Abstract
A Peierls-extended Hubbard model is used to study the effects of electron–electron interactions on the possible ferromagnetic ground state in the polaronic ferromagnet. Considering the strong electron–phonon coupling and allowing for full lattice relaxation, the system is optimized by a set of self-consistent iterative equations. The formation energies of polarons with different spin arrangements are calculated. The results of calculation indicate that the possible ferromagnetic ground state of the system will be affected dramatically by the onsite and intersite e–e interactions. However, for appropriate electron–electron interactions the ferromagnetic state can become a stable ground state.
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