Abstract
The high-field spin susceptibility for ferromagnetic metals is calculated by a method, which is free from the variation method. The method is applied to the numerical calculation of the high-field spin susceptibility for ferromagnetic bcc iron at T =0 K by using the density functional formalism. The band structure used in the numerical calculation is obtained by the linear muffin-tin orbital method and by the local spin density approximation. The calculated value of the high-field spin susceptibility is smaller than the experimental one. This fact indicates the necessity to improve the local spin density approximation.
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