Reduced zero-point spin contraction in impure antiferromagnets

Sólyom, Jenő and Bergou, János (1971) Reduced zero-point spin contraction in impure antiferromagnets. JOURNAL DE PHYSIQUE COLLOQUES, 32. pp. 89-90. ISSN 0449-1947

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Abstract

Impure antiferromagnets containing a substitutional foreign atom of spin S' coupled to its nearest neighbours by exchange coupling I' are considered. The zero-point spin contraction is calcuIated at the impurity site and at its first neighbours for ferromagnetically (I' > 0) as well as antiferromagnetically (I' > 0) coupled impurities. The calculation of < Sz > is performed in a perturbative way in powers of l/z, where z is the number of nearest neighbours. Numerical results are presented for bcc crystal. In the special case of nonmagnetic impurity the zero-point spin contraction on the first neighbours is reduced as compared to a pure antiferromagnet.

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