Abstract
We determine the instability line separating the paramagnetic phase in the phase diagram of the 2-d Hubbard Model from a phase with incommensurate magnetic order. A mean-field approximation of the Kotliar-Ruckenstein slave boson representation is used to calculate the wave-vector dependent magnetic susceptibility. For largeU/t the instability occurs at a densityn≃0.37, and a wave-vector close toq=(0,π). The dependence ofq onU andn is also given.
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Doll, K., Dzierzawa, M., Frésard, R. et al. Instability of the paramagnetic state towards incommensurate magnetic order in the 2-d Hubbard model. Z. Physik B - Condensed Matter 90, 297–300 (1993). https://doi.org/10.1007/BF01433051
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DOI: https://doi.org/10.1007/BF01433051