Inter-cluster coupling effects in high-spin molecular magnets

Abstract We report evidences of antiferromagnetic (AF) transition in Fe 19 metheidi, a new molecular nanomagnet with a total spin S= 33 2 , among the highest known so far. The temperature ( T ) dependence of specific heat ( C ) shows a λ -anomaly at 1.19 K and at the same temperature an anomaly is also observed in the low field (B T ) magnetization M -vs.- T curves. Since the dipolar interaction between clusters is estimated to be ∼190 mK , the origin of the AF transition is probably due to superexchange.