Magnetic and Charge Correlations of the 2-dimensional $t-t’-U$ Hubbard model

Дата и время публикации : 1998-12-15T09:08:12Z

Авторы публикации и институты :
Raymond Frésard
Walter Zimmermann

Ссылка на журнал-издание: Phys. Rev. B, 58 (1998) 15288
Коментарии к cтатье: 14 pages, 5 figures
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: 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 $t’$.

Category: Physics