- Tytuł:
- Approximate Approach to Magnetic and Thermodynamic Properties of Mixed Spin (1/2-S) Chains with AB and $AB_2$ Topology
- Autorzy:
-
Pełka, R.
Pinkowicz, D. - Powiązania:
- https://bibliotekanauki.pl/articles/1534880.pdf
- Data publikacji:
- 2010-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
75.10.Pq
71.70.Gm
75.30.Cr
75.40.Cx - Opis:
- 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.
- Źródło:
-
Acta Physica Polonica A; 2010, 118, 5; 959-961
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł