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In this study we examine the phase transitions in single crystals of[(CH3)2NH2]Co(HCOO)3], using magnetization and specific heat measurements as afunction of temperature and magnetic field. Magnetisation measurements indicatea transition at 15 K that is associated with an antiferromagnetic transition.The results of the isothermal magnetization versus magnetic field curvesdemonstrate the presence of a single-ion magnet phase, coexisting withantiferromagnetism. A peak in specific heat is seen at 15 K, corresponding tothe magnetic transition. The enthalpy of the transition evaluated from the areaunder the specific heat peak decreases with the application of magnetic fieldof upto8 T. This is suggestive of long range antiferromagnetic magnetic order,giving way to single-ion magnetic behavior under external field. In experimentsat high temperatures, corresponding to the well-known structural transition inthis system, the specific heat measurements, shows a peak at ~155K, that isinsensitive to applied magnetic field. The magnetisation in this temperaturerange, while it exhibits a paramagnetic behavior, shows a distinct jump thathas been attributed to a spin-state transition of Co2+ associated with thestructural transition.

Magnetic behavior of the metal organic framework solid: [(CH3)2NH2][Co(HCOO)3]