Abstract
We present two-dimensional angular correlation of (polarized positrons) annihil- ation radiation (20 ACAR) results measured on a single crystal of Ni in the (100) plane below andabove the Curie temperature (at4.2,300, M10and640 K).The rxperimentaldistributions (total momentum density) measured at different temperatures do not exhibit any significant differences, in contradiction to the one-dimensional (non-spin-polarized) results of Kon- trym-Smajd et al. We conclude that the Fermi surface topology of Ni essentially does not change between 4.2 and 600 K. This can be related to the fact that the exchange splitting. A. remainsalmostmnstant up to thecurie temperature. This wouldconfirm thespin-polarized electron-energy-loss spectroscopy results of Kinchner and Langenbach.
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