Abstract
Magnetic properties observed experimentally in the 3d transition‐metal dichalcogenides with the pyrite structure are reviewed and compared with properties expected theoretically for the Hubbard model. As characteristics of electrons in a narrow band, the following are discussed: (1) The temperature induced and field induced local moment in Co(S,Se)2 and (Co,Ni)S2. (2) The metal‐nonmetal transition in NiS2 and its solid solutions. (3) The paramagnetism and antiferromagnetism in the exchange‐enhanced metal Ni(S,Se)2.

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