Intermolecular interactions in the molecular ferromagnetic NH4Ni(mnt)2.H2O

Article Abstract:

Magnetic coupling in the charge-transfer salt NH4Ni(mnt)2.H2O is very sensitive to intermolecular separation, as indicated by the sharp increase with pressure of the Curie temperature setting the transition to the ferromagnetic state until ferromagnetic order suddenly disappears at 6.8 kbar. Such pressure dependence is shown to stem from a competition between ferromagnetic coupling, as a result of nickel-sulphur intermolecular spin interactions, and antiferromagnetic coupling, from nickel-nickel interactions.

Intermolecular forces, Antiferromagnetism

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A ferromagnetic transition at 1.48 K in an organic nitroxide

Article Abstract:

A ferromagnetic transition state is reported for a crystalline nitroxide biradical system. High-field magnetization measurements show that ferromagnetic interactions are exhibited by the nitroxide crystals of N, N'-dioxy-1,3,5,7-tetramethyl-2,6-diazaadamantene. The system was found to have a Curie temperature of 1.48 +/- 0.02 K, the highest so far for any known organic, non-ionic substance.

Ferromagnetic materials

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Origin of ferromagnetic exchange interactions in a fullerene-organic compound

Article Abstract:

Ferromagnetic exchange in a fullerene-organic compound is examined.

Carbon allotropes

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