3 papers
nlin.SI2007★ 14 cited
Thermodynamics of antiferromagnetic alternating spin chains
G. A. P. Ribeiro, A. Klümper
We consider integrable quantum spin chains with alternating spins (S_1,S_2). We derive a finite set of non-linear integral equations for the thermodynamics of these models by use o…
cond-mat.stat-mech2001
Equivalence of TBA and QTM
Minoru Takahashi, Masahiro Shiroishi, Andreas Klumper
The traditional thermodynamic Bethe ansatz (TBA) equations for the XXZ model at are derived within the quantum transfer matrix (QTM) method. This provides further eviden…
cond-mat1998
Competition of Ferromagnetic and Antiferromagnetic Order in the Spin-1/2 XXZ Chain at Finite Temperature
K. Fabricius, A. Klümper, B. M. McCoy
An analytical study is presented of the crossover in the gapless attractive XXZ chain from antiferromagnetic to ferromagnetic behaviour at low to high temperature, respectively. In…