Grzegorz Kamieniarz

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The complementary Monte Carlo and series expansions methods of computer simulations have been described to investigate the critical behaviour of the Ashkin-Teller model in three dimensions. In the first method the invariance of the ratio of the square of the second moment of the order parameter to its fourth moment in the critical region has been exploited(More)
In the field of molecule-based magnetism materials composed of magnetically isolated chains have become the main research trend in last years. The quantum transfer matrix (QTM) method based on a checkerboard structure has been applied to the one-dimensional Heisenberg model with Dzyaloshinskii-Moriya interaction in the S = 1/2 spin chain. This model with(More)
Molecular-based nanomagnets form a class of materials where quantum effects can be observed on a macroscopic scale. Recently they attract much attention because of envisaged applications in the domain of magnetic storage , molecular spintronics and quantum computing. The success of such applications depends to the large extend on the precise modeling of(More)
A comprehensive study of electronic and magnetic properties of Cr8F8Piv16 (HPiv = pivalic acid, trimethyl acetic acid) molecular ring is presented. The total, local and orbital projected density of states are calculated by the first principle density functional theory calculations using the package SIESTA. The original molecule has been approximated by(More)
Monte Carlo simulations in the three-dimensional (3D) Ashkin-Teller model on a cubic lattice are performed in the regions of the two-parameter space diagram where Ising-type phase transitions are expected. The scaling behavior of the Binder cumulant Q and the magnetic susceptibility in the critical region are exploited. In simulations the periodic boundary(More)