Susceptibility Behaviour of CuGeO₃: Comparison between Experiment and the Quantum Transfer Matrix Approach

Abstract

Thermodynamical properties of one-dimensional S = 1/2 Heisenberg model with dimerized nearest-and uniform next-nearest-neighbour interactions are studied by the numerically exact quantum transfer matrix method and the results are applied to CuGeO 3 . Suzuki-Trotter formula is used to obtain a classical system with spin σ = 3/2 and effective interactions between nearest-neigbours only. Magnetic susceptibility curve is calculated and compared with new experimental results performed in a wide temperature range, revealing the presence of frustration in the model proposed for CuGeO 3 .