Ferrimagnetic mixed-spin ladders in weak and strong coupling limits

Abstract

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.

12 pages, 4 figures

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Cited by in corpus (7)

• Integrable models and quantum spin ladders: comparison between theory and experiment for the strong coupling ladder compounds
• Asymmetric spin-1/2 two-leg ladders
• Thermal Properties of Rung Disordered Two-leg Quantum Spin Ladders: Quantum Monte Carlo Study
• Mixed-spin Heisenberg ladders in a magnetic field
• Magnetic phase diagram of a frustrated ferrimagnetic ladder: Relation to the one-dimensional boson Hubbard model
• Phase diagram of frustrated mixed-spin ladders in the strong-coupling limit
• Thermodynamic properties of disordered quantum spin ladders