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VOLUME 51 (1990) | ISSUE 12 | PAGE 640
Random magnetic fields and tricritical behavior of diamagnetically dilute antiferromagnets (Ni1-xMgx)O
The solid solutions (Nix _ xMgx)О are used as an example to show, for the first time, that a random substitution of magnesium ions in the nickel sublattice is manifested as a random-magnetic-field effect. This effect first causes a local magnetic disorder and then leads to a complete disruption of the long-range magnetic order in a topologically infinite antiferromagnetic cluster. A region of tricritical behavior and a cluster spin glass appears.