Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-01-15
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.
Aristov Dmitry N.
Kiselev Michael N.
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