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Volume dependence of the Stoner parameter in transition metals

Magnetostriction and susceptibility measurements for transition metals and their alloys, and thermal expansion data for chromium, suggest a relatively strong volume dependence of the Stoner parameter. This feature is not evident in calculations in the local spin density approximation. However, explicit inclusion of electron correlations reduces the kinetic-energy cost of magnetic ordering and gives a substantial reduction of the effective Stoner parameter as volume increases.