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Recently, the possibility of exploiting the phenomenon of spin transition(ST) has been intensively investigated, therefore, it is particularly importantto study the behavior of ST under various stimuli. Here, the shape and contentof the intermediate phase of ST in Hoffmann-like compounds [Fe(Fpz)2M(CN)4](M =Pt, Pd) under external stimuli are studied. For this purpose, magnetic andRaman spectroscopy measurements were carried out. In pressure-induced spintransition (PIST), a mixture of high-spin and low-spin states appears, while intemperature-induced spin transition (TIST), a homogeneous state occurs. Thefirst-order ST induced by pressure has a hysteresis, but is not abrupt.Whereas, the temperature-induced spin transition at ambient pressure ishysteretic and abrupt. To investigate this difference, we discuss using athermodynamic model that considers elastic interactions, showing that the slopeof the hysteresis loop is related to the appearance of internal pressure, whichis related to the difference in sample compressibility under high spin and lowspin states.

Pressure-induced mixed states caused by spin-elastic interactions during first-order spin phase transition in spin crossover compounds