Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.44: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Interchain Coupling in Mixed-Spin Quantum-Ferrimagnets — •Simon Grossjohann, Andreas Honecker, and Wolfram Brenig — Institut für Theoretische Physik, Technische Universität Braunschweig, Germany

We present an analysis of the thermodynamic properties of 1D- and 2D-mixed-spin quantum-magnets. Using the Stochastic Series Expansion method for evaluating the partition function we provide results for the uniform susceptibility and the static structure factor. The relevance of the Random Phase Approximation to describe interchain-exchange is investigated by extracting effective interchain-coupling-constants from our numerical findings. Furthermore, we provide a finite-size-scaling analysis of the static structure factor for selected system-parameters to adress the question of zero temperature long-range magnetic ordering. Finally we comment on the relation of our results to bulk thermodynamic data recently observed in the molecular ferrimagnet MnNi(NO₂)₄(en)₂.