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Ground-State Configurations of 2D Clusters of Classical Charged Particles

100%

Sobczak P., Kamieniarz G.

Acta Physica Polonica A

2008

vol. 113

issue 1

477-480

The ground-state configurations of the classical point-charge particles were calculated using a new genetic-algorithm-based approach. The structures obtained confirmed the recent Monte Carlo findings, including the metastable states.

DMRG Approach to a Molecular-Based Bimetallic Chain Containing Re(IV) and Cu(II) Ions

61%

Sobczak P., Barasiński A., Matysiak R., Drzewiński A., Kamieniarz G., Bieńko A., Mroziński J.

issue 5

975-977

The bimetallic chain complex [Cu(tren)]ReCl_6 is numerically analysed on the basis of the anisotropic quantum Heisenberg model without the mean-field corrections by the density-matrix renormalization group approach. The high accuracy results of our simulations have been fitted to the corresponding experimental susceptibility data above the crossover regime. The set of model parameters comprising the strength of antiferromagnetic couplings, the single-ion anisotropy term and the corresponding g factors have been found: J/k_{B} = 3.5 ± 0.5 K, D/k_{B} = 35 ± 5 K, g_{Cu} = 2.07 ± 0.05 and g_{Re} = 1.73 ± 0.01.

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets

42%

Kamieniarz G., Kozłowski P., Antkowiak M., Sobczak P., Ślusarski T., Tomecka D., Barasiński A., Brzostowski B., Drzewiński A., Bieńko A., Mroziński J.

Acta Physica Polonica A

2012

vol. 121

issue 5-6

992-998

In this paper we review our results of comprehensive study of molecular nanomagnets recently synthesized in the form of the chromium-based molecules and bimetallic copper-containing chains as well as we present some new findings. We focus on effects of anisotropy, geometry and frustration appearing in various thermodynamic properties of the nanoscale magnets which are described by Heisenberg-like spin models and simulated by accurate numerical methods. We show that bond-dependent exchange anisotropy is needed to model magnetic torque in the Cd-doped chromium ring. We argue that only in the limit of infinite rings (n → ∞) frustration can be considered as the opposite to bipartiteness in the odd numbered (3 ≤ n ≤ 9) s = 3/2 quantum spin rings. We analyse the influence of exchange interactions and anisotropy on magnetic susceptibility of bimetallic (S = 3/2, s = 1/2) chains composed of Cu ions linked to different 3d ions by fitting experimental data. We reach the remarkable consistency of the density functional theory estimates of the magnetic couplings in Cr_8 molecule and provide strong support to the spin models exploited in the literature.

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3 Acta Physica Polonica A

1 2012

1 2010

1 2008

3 Kamieniarz G.

3 Sobczak P.

2 Barasiński A.

2 Bieńko A.

2 Drzewiński A.

2 Mroziński J.

1 Antkowiak M.

1 Brzostowski B.

1 Kozłowski P.

1 Matysiak R.

1 Tomecka D.

1 Ślusarski T.

Search results

Ground-State Configurations of 2D Clusters of Classical Charged Particles

DMRG Approach to a Molecular-Based Bimetallic Chain Containing Re(IV) and Cu(II) Ions

Anisotropy, Geometric Structure and Frustration Effects in Molecule-Based Nanomagnets