Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”
TT 24.8: Poster
Mittwoch, 10. März 2004, 14:30–19:00, Poster A
Thermodynamic properties of ferromagnetic mixed-spin chain systems — •Noboru Fukushima1, Andreas Honecker1, Stefan Wessel2, and Wolfram Brenig1 — 1Institut für Theoretische Physik, Technische Universität Braunschweig, Germany — 2Theoretische Physik, ETH Zürich, Switzerland
Using a combination of high-temperature series expansion, exact diagonalization and quantum Monte Carlo, we perform a complementary analysis of the thermodynamic properties of one-dimensional mixed-spin systems with alternating magnetic moments. In particular, we focus on the difference between ferromagnetic (FM) and antiferromagnetic (AFM) exchange. Not only the peak structure of the specific heat is more pronounced in the FM case, but also the number of the peaks appears different. Namely, the FM case seems to have some additional energy scale(s). The origin of these differences will be discussed. In addition, the impact of interchain exchange will be also investigated.