Magnetic-glassy multicritical behavior of the three-dimensional +- J Ising model

Abstract

We consider the three-dimensional $\pm J$ model defined on a simple cubic lattice and study its behavior close to the multicritical Nishimori point where the paramagnetic-ferromagnetic, the paramagnetic-glassy, and the ferromagnetic-glassy transition lines meet in the T-p phase diagram (p characterizes the disorder distribution and gives the fraction of ferromagnetic bonds). For this purpose we perform Monte Carlo simulations on cubic lattices of size $L\le 32$ and a finite-size scaling analysis of the numerical results. The magnetic-glassy multicritical point is found at $p^{\ast }=0.76820(4)$, along the Nishimori line given by $2p-1=\mathrm{Tanh}(J/T)$. We determine the renormalization-group dimensions of the operators that control the renormalization-group flow close to the multicritical point, $y_1=1.02(5)$, $y_2=0.61(2)$, and the susceptibility exponent $\eta =-0.114(3)$. The temperature and crossover exponents are $\nu =1/y_2=1.64(5)$ and $\varphi =y_1/y_2=1.67(10)$, respectively. We also investigate the model-A dynamics, obtaining the dynamic critical exponent $z=5.0(5)$.

17 pages

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