Low-Energy Properties of Antiferromagnetic Spin-1/2 Heisenberg Ladders   with an Odd Number of Legs
  An effective low-energy description for multi-leg spin-1/2 Heisenberg ladders with an odd number of legs is proposed. Using a newly developed Monte Carlo loop algorithm and exact diagonalization techniques, the uniform and staggered magnetic susceptibility and the entropy are calculated for ladders with 1, 3, and 5 legs. These systems show a low-temperature scaling behavior similar to spin-1/2 chains with longer ranged unfrustrated exchange interactions. The spinon velocity does not change as the number of legs increases, but the energy scale parameter decreases markedly. 
Beat Frischmuth, Stephan Haas, German Sierra, and T.M. Rice