Abstract
We report the results of dc susceptibility and heat capacity measurements on the (ball-milled) nanocrystalline rare-earth (R) ternary compound, crystallizing in Gd4RhIn-type, cubic Dy4RhAl compound (space group F4¯3m, No. 216, cF96). The bulk form of this compound has been known to undergo antiferromagnetic ordering at (TN = ) 18 K with concomitant cluster spin-glass anomalies. The present studies on the nano-form obtained by ball-milling reveal that this antiferromagnetic ordering is suppressed with the reduction of particle size with no feature attributable to a well-defined long-range magnetic ordering down to 1.8 K, but showing an inhomogeneous magnetism below 10 K. The point being stressed is that the results show the dominance of a feature around 30 K in the magnetic susceptibility data - well above TN of the bulk form - mimicking Griffiths phase. We infer that surface magnetism dominates before long-range magnetic ordering occurs in this material.
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