ESR study of the magnetic behavior of manganese thiophosphate (Mn2P2S6) intercalation compounds

The ESR spectra of Mn₂P₂S₆ and several intercalation compounds of Mn₂P₂S₆ are reported. The temperature dependence of the ESR line width in the case of pure Mn₂P₂S₆ is consistent with antiferromagnetic ordering of Mn₂P₂S₆ below 78 K. The behavior of the ESR spectrum for ammonia and pyridine intercalation compounds of Mn₂P₂S₆ suggests that these materials also order antiferromagnetically but at much lower temperatures than pure Mn₂P₂S₆ (11 and 36 K compared to 78 K). Cobaltocene-intercalated Mn₂P₂S₆ appears to order ferromagnetically below 50 K.