Magnetic ground state and phase diagram, Hc(T), for magnetically ordered [Ru2(O2CMe)4]3[Cr(CN)6]

The magnetic phase diagram for [Ru-2(O2CMe)(4)](3)[Cr(CN)(6)] was determined from temperature dependent isothermal magnetization studies below its 33-K T-c. Below similar to 25 K, the change in slope of the M(H) for similar to 1100 +/- 400 Oe increases with increasing temperature, as does the initial slope at lower applied field, whereas above similar to 25 K, the slope decreases with increasing temperature. The M(H) below its 25-K tricritical point is characteristic of a first order transition, whereas above 25 K, it is characteristic of a second order transition. The magnetic phase diagram of [Ru-2(O2CMe)(4)](3)[Cr(CN)(6)] is characteristic of a class I metamagnet and has an antiferromagnetic ground-state arising from antiferromagnetically coupled ferrimagnetic lattices.