Ferrimagnetic mixed-spin ladders in weak and strong coupling limits

Details Ferrimagnetic mixed-spin ladders in weak and strong coupling limits Ferrimagnetic mixed-spin ladders in weak and strong coupling limits

2004-01-15

arxiv.org/abs/cond-mat/0401264v2

Phys.Rev. B 70, 224402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.224402

We study two similar spin ladder systems with the ferromagnetic leg coupling. First model includes two sorts of spins, s= 1/2 and s= 1, and the second model comprises only s=1/2 legs coupled by a "triangular" rung exchange. The antiferromagnetic (AF) rung coupling destroys the long-range order and eventually makes the systems equivalent to the AF s=1/2 Heisenberg chain. We investigate the situation by different methods in weak and strong rung coupling limits. Particularly we compare the spin-wave theory and the bosonization method in the weak coupling regime of the second model. We analyze the spectra and correlations, and discuss the order parameter of these ladder systems.

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