Abstract
The molecule-based magnet [Ru2(O2CMe)4]3[Cr(CN)6] contains two interpenetrating sublattices
with each sublattice moment confined by anisotropy to a cubic diagonal. At ambient pressure, a
field of about 850 Oe rotates the antiferromagnetically-coupled sublattice moments towards the field
direction, producing a wasp-waisted magnetization curve. Up to 7 kbar, the sublattice moments
increase with pressure due to the enhanced exchange coupling between the Cr and Ru2 spins on each
sublattice. Above 7 kbar, the sublattice moment drops by about half and the the linear susceptibility
of each sublattice along the cubic diagonal increases dramatically. The most likely explanation for
this phase transition is that a high- to low-spin transition on each Ru2 complex reverses and lowers
the net spin of each sublattice.
