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Mean-field type Ising spin glass in a diluted rare-earth intermetallic compound

We have investigated a phase transition of a long-range RKKY Ising spin glass \dyyrusi by means of the dc and the ac magnetization measurements. The static nonlinear susceptibility $χ_{2}$ exhibits a divergent behavior toward $\Tg$ $=$ 1.925 K with the exponent of $γ$ $=$ 1.08. The characteristic relaxation time $τ$ obtained from the ac magnetization measurements also diverges to the same $\Tg$ with the exponent of $zν$ $=$ 1.9 in zero static field . These results indicate the spin glass phase transition belonging to the mean-field universality class, in which the exponents of $\gammaMF$ and $\znuMF$ are 1 and 2 respectively. Moreover, we observed the divergence of $τ$ in a finite field of 500 Oe toward $\Tg$ $=$ 1.412 K with the exponent of $zν$ $=$ 2.1, being quite similar to that in zero field. It strongly suggests an existence of the spin glass phase transition in a finite field and the replica symmetry breaking (RSB) in the long-range Ising spin glass \dyyrusi.