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The exchange interactions of Cr4N, Mn4N, Fe4N, Co4N, and Ni4N compounds withperovskite structure were calculated to obtain the Curie temperatures for thesecompounds from Monte Carlo calculations. Contrary to naive expectation, theexchange interactions vary markedly among these five compounds. In Fe4N, theintra-sublattice interaction of the Fe 3c atoms is strongly negative, leadingto a significant reduction of the Curie temperature. The calculated Curietemperatures are 291K (Cr4N), 710K (Mn4N), 668K (Fe4N), 827K (Co4N), and 121K(Ni4N), in good agreement with experimental observations where available. Themuch lower Curie temperature of Ni4N compared to fcc Ni is explained on thebasis of the exchange interactions.

Exchange interactions and Curie temperatures of the tetrametal nitrides Cr4N, Mn4N, Fe4N, Co4N, and Ni4N