Magnetic and charge correlations of the two-dimensional ttU Hubbard model

Raymond Frésard and Walter Zimmermann
Phys. Rev. B 58, 15288 – Published 15 December 1998
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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.

  • Received 31 July 1998

DOI:https://doi.org/10.1103/PhysRevB.58.15288

©1998 American Physical Society

Authors & Affiliations

Raymond Frésard*

  • Institut de Physique, Université de Neuchâtel, A-L Breguet 1, 2000 Neuchâtel, Switzerland

Walter Zimmermann

  • Institut für Theorie der Kondensierten Materie, Physikhochhaus, Postfach 6980, Universität Karlsruhe, 76128 Karlsruhe, Federal Republic of Germany

  • *Electronic address: Raymond.Fresard@iph.unine.ch
  • Electronic address: walter@tkm.physik.uni-karlsruhe.de

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Vol. 58, Iss. 23 — 15 December 1998

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