Magnetic studies on the dilute paired antiferromagnet RbMn1−xMgxCl3

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Abstract
Magnetic susceptibility and electron paramagnetic resonance experiments have been conducted on the RbMn1−xMgxCl3 system at temperatures ranging from 4.2 to 300 K and in magnetic fields up to 100 kOe. In the pure manganese compound the neighboring magnetic ions are alternately coupled by strong and weak exchange interactions, leading to a paired antiferromagnetic structure. The effect of diluting the manganese with up to 50% magnesium, a nonmagnetic species, has been examined. It is found that most of the results are consistent with what one finds in an ordinary diluted antiferromagnet. The notable exception exists in the concentration dependence of the ordering temperature. In the low dilution regime (x<.15) a nonlinear concentration dependence on the Neel temperature is found. This is attributed to the formation of chains of weakly interacting spins. These act to circumvent the magnetically stiff pairs produced at each of the strong exchange interactions, and thereby partially offset the effect of the broken magnetic bonds produced during the dilution process.

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