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Susceptibility Behaviour of CuGeO_{3}: Comparison between Experiment and the Quantum Transfer Matrix Approach

100%

Bieliński M., Renard J.

Acta Physica Polonica A

2000

vol. 97

issue 5

851-854

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}.

Quantum Effects and Critical Behavior in Low-Dimensional Spin-1/2 Systems

71%

Kamieniarz G., Musial G., Dębski L., Bieliński M., Dekeyser R.

Acta Physica Polonica A

1997

vol. 92

issue 2

445-447

The critical coupling and spontaneous magnetization curve for the 2D-Ising model are calculated using the effective-field method with correlations. An application of the method to the quantum S=1/2 1D-Heisenberg model is presented and reliable low-temperature estimates of the specific heat are evaluated.

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2 Acta Physica Polonica A

1 2000

1 1997

2 Bieliński M.

1 Dekeyser R.

1 Dębski L.

1 Kamieniarz G.

1 Musial G.

1 Renard J.

Search results

Susceptibility Behaviour of CuGeO_{3}: Comparison between Experiment and the Quantum Transfer Matrix Approach

Quantum Effects and Critical Behavior in Low-Dimensional Spin-1/2 Systems