Phase diagram of frustrated mixed-spin ladders in the strong-coupling limit

Details Phase diagram of frustrated mixed-spin ladders in the strong-coupling limit Phase diagram of frustrated mixed-spin ladders in the strong-coupling limit

2006-09-12

arxiv.org/abs/cond-mat/0609269v2

Eur. Phys. J. B 57, 265 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 2 figure

Scientific paper

10.1140/epjb/e2007-00180-9

We study the ground-state properties of frustrated Heisenberg ferrimagnetic ladders with antiferromagnetic exchange interactions and two types of alternating sublattice spins. In the limit of strong rung couplings, we show that the mixed spin-1/2 and spin-1 ladders can be systematically mapped onto a spin-1/2 Heisenberg model with additional next-nearest-neighbor exchanges. The system is either in a ferrimagnetic state or in a critical spin-liquid state depending on the competition between the spin exchanges along the legs and the diagonal exchanges.

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