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Journal of Magnetism and Magnetic Materials

The finite size scaling of the partition function zeros in a two dimensional Blume-Capel model

K.L. Ayat, CHRISTOPHER M. CARE

Published Oct 1, 1993• 5 citations
Publisher
DOI
10.1016/0304-8853(93)90189-9

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Abstract We show that accurate insights into the critical properties of the Blume–Capel model at two dimensions can be deduced from Monte Carlo simulations, even for small system sizes, when one analyses the behaviour of the zeros of the partition function. The phase diagram of the model displays a line of second-order phase transitions ending at a tricritical point, then a line of first-order transitions. We concentrate on critical and tricritical properties and compare the accuracy achieved via standard finite-size scaling of thermodynamic quantities with that from the zeros analysis. This latter analysis showcases spectacular precision, even for systems as small as 64 spins. We also show that the zeros are very sensitive to subtle crossover effects.