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Imaginary part of the renormalized spin susceptibility for fcc Ni

Renormalized spin susceptibility for nickel
Imaginary part of the renormalized spin susceptibility for fcc Ni as a function of momentum and frequency, obtained from a series of first-principles Bethe-Salpeter calculations. The quadratic spin-wave dispersion is clearly visible. The high resolution of the picture reveals strong mixing of collective and single-particle (Stoner) excitations, which can lead to energy gaps in the spin-wave branch (see inset).
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