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The response function χ(→K,ω) of nickel has been calculated over a wide range of temperatures on the basis of a tight-binding band structure with allowance for electron-electron interactions. Spin-wave broadening and renormalization, the steady development of χ through Tc [away from the singularity at χ(0,0)], and the occurrence of "vestigial" spin waves above Tc are all well illustrated. With a Hubbard-Gutzwiller-Kanamori Ieff~0.6 eV atom^-1 there is quite good absolute agreement with experiment, this agreement being improved if a suitably K-dependent Ieff(K) be introduced.
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Windsor et al. (1969) studied this question.
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