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Approximate Approach to Magnetic and Thermodynamic Properties of Mixed Spin (1/2-S) Chains with AB and AB_2 Topology

100%

Pełka R., Pinkowicz D.

Acta Physica Polonica A

2010

vol. 118

issue 5

959-961

Motivated by the rapid development in the synthesis of novel molecule-based magnets, we have investigated magnetic and thermodynamic properties of mixed spin (s-S) exchange coupled chains displaying a simple linear AB or a knotted AB_2 arrangement. Approximate approach for s = 1/2 and S ≥ 5/2, treating at an intermediate step spin S operator as a commuting variable and using the transfer matrix technique, is used. Susceptibility, magnetization and heat capacity of both spin systems are evaluated numerically from the corresponding free energy for S = 5/2. Uniform ferromagnetic and antiferromagnetic couplings are discussed. The procedure reproduces the right values of saturation magnetization and the entropy content of the systems, corroborating its correctness. χ T curves are shown to depend crucially on the μ_{B} H/J ratio. For zero-field heat capacity a double-peak structure is revealed for the AB chain, whereas for the AB_2 chain only one broad anomaly is observed.

Magnetic Systems at Criticality: Different Signatures of Scaling

42%

Pełka R., Konieczny P., Fitta M., Czapla M., Zieliński P., Bałanda M., Wasiutyński T., Miyazaki Y., Inaba A., Pinkowicz D., Sieklucka B.

Acta Physica Polonica A

2013

vol. 124

issue 6

977-989

Different aspects of critical behaviour of magnetic materials are presented and discussed. The scaling ideas are shown to arise in the context of purely magnetic properties as well as in that of thermal properties as demonstrated by magnetocaloric effect or combined scaling of excess entropy and order parameter. Two non-standard approaches to scaling phenomena are described. The presented concepts are exemplified by experimental data gathered on four representatives of molecular magnets.

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2 Acta Physica Polonica A

1 2013

1 2010

2 Pełka R.

2 Pinkowicz D.

1 Bałanda M.

1 Czapla M.

1 Fitta M.

1 Inaba A.

1 Konieczny P.

1 Miyazaki Y.

1 Sieklucka B.

1 Wasiutyński T.

1 Zieliński P.

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Approximate Approach to Magnetic and Thermodynamic Properties of Mixed Spin (1/2-S) Chains with AB and AB_2 Topology

Magnetic Systems at Criticality: Different Signatures of Scaling