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

TL;DR

This study investigates the multicritical behavior of the three-dimensional ±J Ising model near the Nishimori point using Monte Carlo simulations, revealing critical exponents and dynamic properties of the magnetic-glassy transition.

Contribution

It provides the first detailed finite-size scaling analysis of the multicritical Nishimori point in the 3D ±J Ising model, including critical exponents and dynamic behavior.

Findings

Critical point at p* = 0.76820(4) on the Nishimori line.

Renormalization-group dimensions y1=1.02(5), y2=0.61(2).

Dynamic critical exponent z=5.0(5).

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 $p^*=0.76820(4)$, along the Nishimori line given by $2p-1={\rm Tanh}(J/T)$. 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 $\phi=y_1/y_2 = 1.67(10)$, respectively. We also investigate the model-A dynamics, obtaining the dynamic critical exponent $z = 5.0(5)$.