A criterion for ferromagnetism is developed for the case of a twofold degenerate band having a rapid variation of the density of states at the Fermi surface. An exchange splitting of spin-up and spin-down bands, which is different for the two different subbands, and an over-all splitting of the two subbands is obtained, even if the Stoner criterion is not fulfilled, i. e., for $1>N(0)U$.
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H. Capellmann (1973) studied this question.
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