Susceptibility Behaviour of CuGeO3: Comparison between Experiment and the Quantum Transfer Matrix Approach
M. Bieliński
Institute of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznań, Poland

and J.-P. Renard
Institut d'Electronique Fondamentale, Université Paris-Sud, Bâtiment 220, 91405 Orsay Cedex, France

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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 CuGeO3. 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 CuGeO3.
DOI: 10.12693/APhysPolA.97.851
PACS numbers: 75.10.Jm, 75.40.Cx, 75.40.Mg