Abstract

The combined electrostriction and magnetostriction Casimir force on a compact sphere placed in a vacuum is calculated, provided that the medium satisfies the relationship epsilon mu =1, epsilon being the permittivity and mu the permeability. This special class of media is known to possess attractive properties (Brevik and Kolbenstvedt, 1982): cut-off terms that otherwise represent a difficulty in Casimir calculations for ordinary non-magnetic media (Milton 1980, Brevik 1982) simply cancel out in the surface force expression. This note examines the question whether similar cancellations occur in the striction force when the magnetostriction part is included. The answer is negative.

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