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Magnetic and Charge Correlations of the 2-dimensional $t-t'-U$ Hubbard model | | Raymond Frésard
; Walter Zimmermann
; | | Date: |
15 Dec 1998 | | Journal: | Phys. Rev. B, 58 (1998) 15288 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | 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 $t’$. | | Source: | arXiv, cond-mat/9812242 | | Services: | Forum | Review | PDF | Favorites | |
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