Numerical Study of a Mixed Ising Ferrimagnetic System

Details Numerical Study of a Mixed Ising Ferrimagnetic System Numerical Study of a Mixed Ising Ferrimagnetic System

1995-09-13

arxiv.org/abs/cond-mat/9509076v1

J. Physics: Cond. Mat. 9, 5951 (1997)

Physics

Condensed Matter

Figures can be obtained by request to novotny@scri.fsu.edu or buendia@usb.ve

Scientific paper

10.1088/0953-8984/9/27/021

We present a study of a classical ferrimagnetic model on a square lattice in which the two interpenetrating square sublattices have spins one-half and one. This model is relevant for understanding bimetallic molecular ferrimagnets that are currently being synthesized by several experimental groups. We perform exact ground-state calculations for the model and employ Monte Carlo and numerical transfer-matrix techniques to obtain the finite-temperature phase diagram for both the transition and compensation temperatures. When only nearest-neighbor interactions are included, our nonperturbative results indicate no compensation point or tricritical point at finite temperature, which contradicts earlier results obtained with mean-field analysis.

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