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$H$-$T$ diagram of 3D diluted Ising antiferromagnetNi$_{c}$Mg$_{1-c}$(OH)$_{2}$ with $c$ = 0.8 has been determined frommeasurements of SQUID DC magnetization and AC magnetic susceptibility. At $H$ =0, this compound undergoes two magnetic phase transitions: an antiferromagnetic(AF) transition at the N\'{e}el temperature $T_{N}$ (= 20.7 K) and a reentrantspin glass (RSG) transition at $T_{RSG}$ ($\approx$ 6 K). The $H$-$T$ diagramconsists of the RSG, spin glass (SG), and AF phases. These phases meet amulticritical point $P_{m}$ ($H_{m}$ = 42 kOe, $T_{m}$ = 5.6 K). Theirreversibility of susceptibility defined by $\delta$ (= $\chi_{FC} -\chi_{ZFC}$) shows a negative local minimum for 10 $\leq H \leq$ 35 kOe,suggesting the existence of possible glassy phase in the AF phase. A broad peakin $\delta$ and $\chi^{\prime \prime}$ at $H \geq$ 20 kOe for $T_{N}(c=0.8,H)\leq T \leq T_{N}(c=1,H=0)$ (= 26.4 K) suggests the existence of the Griffithsphase.Comment: 11 pages, 14 figures; J. Phys. Soc. Jpn. 73 (2004) No. 1 issue, in  pres

Magnetic Phase Diagram of Three-Dimensional Diluted Ising Antiferromagnet Ni0.8Mg0.2(OH)2

Magnetic Phase Diagram of Three-Dimensional Diluted Ising Antiferromagnet Ni_0.8Mg_0.2(OH)₂