Orbital Ordering, New Phases, and Stripe Formation in Doped Layered Nickelates

Details Orbital Ordering, New Phases, and Stripe Formation in Doped Layered Nickelates Orbital Ordering, New Phases, and Stripe Formation in Doped Layered Nickelates

2004-01-29

arxiv.org/abs/cond-mat/0401596v1

Phys. Rev. Lett. 92, 227201 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.227201

Ground-state properties of layered nickelates are investigated based on the orbital-degenerate Hubbard model coupled with lattice distortions, by using umerical techniques. The N\'eel state composed of spin S=1 ions is confirmed in the undoped limit x=0. At x=1/2, novel antiferromagnetic states, called CE- and E-type phases, are found by increasing the Hund's coupling. (3 x^2 - r^2 / 3 y^2 - r^2)-type orbital ordering is predicted to occur in a checkerboard-type charge-ordered state. At x=1/3, both Coulombic and phononic interactions are found to be important, since the former stabilizes the spin stripe, while the latter leads to the striped charge-order.

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