Magnetic and Charge Correlations of the 2-dimensional t-t'-U Hubbard model
Raymond Frésard, Walter Zimmermann
Abstract
Using a spin-rotation invariant six-slave boson representation, we study the square lattice Hubbard model with nearest-neighbor hopping t and next-nearest neighbor hopping t'. We discuss the influence of t' on the charge and magnetic properties. In the hole-doped domain, we find that a negative t' strongly favors itinerant ferromagnetism over any incommensurate phase, especially in the strong coupling regime. For positive t' magnetic fluctuations are suppressed. A tight connection between frustrated charge dynamics and large magnetic fluctuations is pointed out. A clear tendency towards striped charge ordering is found in the regime of large positive t'.
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