Pressure-Induced Enhancement Of The Magnetic Anisotropy In Mn(N(Cn)(2))(2)

Using dc and ac magnetometry, the pressure dependence of the magnetization of the three- dimensional antiferromagnetic coordination polymer Mn(N(CN)(2))(2) was studied up to 12 kbar and down to 8 K. The antiferromagnetic transition temperature, T-N, increases dramatically with applied pressure (P), where a change from T-N(P = ambient) = 16.0 K to T-N(P = 12.1 kbar) = 23.5 K was observed. In addition, a marked difference in the magnetic behavior is observed above and below 7.1 kbar. Specifically, for P < 7.1 kbar, the differences between the field-cooled and zero-field-cooled magnetizations, the coercive field, and the remanent magnetization decrease with increasing pressure. However, for P > 7.1 kbar, the behavior is inverted. Additionally, for P > 8.6 kbar, minor hysteresis loops are observed. All of these effects are evidence of the increase of the superexchange interaction and the appearance of an enhanced exchange anisotropy with applied pressure.