Susceptibility behaviour of CuGeO3: Comparison between experiment and the quantum transfer matrix approach

Thermodynamical properties of one-dimensional S = 1/2 Heisenberg model with dimerized nearest- and uniform next-nearest-neighbour interactions are stu died by the numerically exact quantum transfer matrix method and the result s are applied to CuGeO3. Suzuki-Trotter formula is used to obtain a classic al system with spin sigma = 3/2 and effective interactions between nearest- neigbours only. Magnetic susceptibility curve is calculated and compared wi th new experimental results performed in a wide temperature range, revealin g the presence of frustration in the model proposed for CuGeO3.