# Scaling and universality in the phase diagram of the 2D Blume-Capel model

Johannes Zierenberg, Nikolaos G. Fytas, Martin Weigel, Wolfhard Janke, Anastasios Malakis

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### Abstract

We review the pertinent features of the phase diagram of the zero-field Blume-Capel model, focusing on the aspects of transition order, finite-size scaling and universality. In particular, we employ a range of Monte Carlo simulation methods to study the 2D spin-1 Blume-Capel model on the square lattice to investigate the behavior in the vicinity of the first-order and second-order regimes of the ferromagnet-paramagnet phase boundary, respectively. To achieve high-precision results, we utilize a combination of (i) a parallel version of the multicanonical algorithm and (ii) a hybrid updating scheme combining Metropolis and generalized Wolff cluster moves. These techniques are combined to study for the first time the correlation length of the model, using its scaling in the regime of second-order transitions to illustrate universality through the observed identity of the limiting value of $\xi/L$ with the exactly known result for the Ising universality class.

Publisher Statement: The final publication is available at Springer via http://dx.doi.org/10.1140/epjst/e2016-60337-x
Original language English 789-804 16 The European Physical Journal Special Topics 226 https://doi.org/10.1140/epjst/e2016-60337-x Published - 5 Apr 2017

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Phase diagrams
phase diagrams
scaling
Phase boundaries
simulation
Monte Carlo simulation

### Keywords

• cond-mat.stat-mech

### Cite this

Scaling and universality in the phase diagram of the 2D Blume-Capel model. / Zierenberg, Johannes; Fytas, Nikolaos G.; Weigel, Martin; Janke, Wolfhard; Malakis, Anastasios.

In: The European Physical Journal Special Topics, Vol. 226, 05.04.2017, p. 789-804.

Research output: Contribution to journalArticle

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AU - Malakis, Anastasios

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AB - We review the pertinent features of the phase diagram of the zero-field Blume-Capel model, focusing on the aspects of transition order, finite-size scaling and universality. In particular, we employ a range of Monte Carlo simulation methods to study the 2D spin-1 Blume-Capel model on the square lattice to investigate the behavior in the vicinity of the first-order and second-order regimes of the ferromagnet-paramagnet phase boundary, respectively. To achieve high-precision results, we utilize a combination of (i) a parallel version of the multicanonical algorithm and (ii) a hybrid updating scheme combining Metropolis and generalized Wolff cluster moves. These techniques are combined to study for the first time the correlation length of the model, using its scaling in the regime of second-order transitions to illustrate universality through the observed identity of the limiting value of $\xi/L$ with the exactly known result for the Ising universality class.Publisher Statement: The final publication is available at Springer via http://dx.doi.org/10.1140/epjst/e2016-60337-x

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