In the frame of the formalism of functional integration we consider a Hubbard model with repulsion by taking into account the next nearest neighbour hopping. It is shown that for sufficiently small temperatures and doping parameter, the system is antiferromagnetically ordered. General expressions for the order parameter are obtained.
A formalism is established to obtain the magnetic susceptibility tensor components in the frame of spin wave rotary representation, which describes both dynamic response and dispersion relation for magnon–polariton interaction in the long wavelength approximation. The exchange strength is considered taking into account the Phillips‐Rosenberg approach.
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