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Thermodynamics of Ising Ferromagnet Studied by the Real-Space Renormalization Group Method

100%
Reich W., Piotrkowska K., Esposito U., Caramico D'Auria A.
Acta Physica Polonica A
|
1993
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vol. 84
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issue 2
275-278
EN
The critical exponents of the 3D Ising model were calculated in the approximation of the fourth-order cumulant expansion. Thermodynamic functions in the high-temperature range are obtained.
2
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Transfer-Matrix Simulations of Linear Magnetic Systems

100%
Matysiak R., Caramico D'Auria A., Esposito F., Esposito U.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
959-962
EN
The quantum transfer-matrix method was applied to study the finite-temperature static properties of the spin S=1 antiferromagnetic Heisenberg chains in a wide range of the single-ion anisotropy and temperatures. The high-resolution quantum transfer-matrix simulation data are obtained for the zero-field susceptibility, specific heat as well as for the field-dependent magnetization. The microscopic parameters of a number of real quasi-one-dimensional compounds are found from fitting procedures, some theoretical approaches are numerically verified and an extension of the technique to a non-uniform bond alternating molecular magnets is also put forward.
3
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Numerical Simulations of Linear S=1 Ferro- and Antiferromagnets

88%
Kamieniarz G., Matysiak R., Caramico D'Auria A., Esposito F., Esposito U.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
387-389
EN
The finite-temperature static properties of the spin S=1 antiferromagnetic Heisenberg chains are extensively simulated using the quantum transfer matrix method. The zero-field susceptibility and specific heat as well as the field-dependent magnetization data are evaluated to select the microscopic parameters of a number of real quasi-one-dimensional compounds and to verify some theoretical approaches.
4
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Direct Simulations of the Quantum Model for CsNiF_{3}

88%
Caramico D'Auria A., Esposito F., Esposito U., Kamieniarz G., Dekeyser R.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
409-412
EN
We address the problem of reliability of a finite-chain technique for CsNiF_{3}. We investigate the effect of the boundary conditions, completely neglected so far, and apply a new extrapolation procedure appropriate for quantities showing non-monotonic behaviour. From a detailed analysis of the specific heat existing theoretical estimates for the model parameters are discriminated and a strong evidence for the reliability of the direct finite-chain technique predictions is presented.
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