Temperature and wave-vector dependence of the spin-split band structure of Ni(111) along the Γ-Lline

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Abstract
Spin- and angle-resolved photoemission measurements on a Ni(111) single crystal along the Γ-L line exhibit a strong wave-vector dependence of the spin-resolved photoemission intensities upon increasing the temperature: For excitation with hν=11.83 eV [i.e., at k≃2/3d(Γ-L)] one observes a clear merging of the spin-split peaks with increasing temperature. The spin splitting at k≃1/2d(Γ-L) (hν=16.85 eV) is, however, independent of temperature. Upon approaching the Curie temperature, one observes the appearance of extra intensities at the binding energy of the respective opposite spin direction. Indications of an essentially temperature-independent spin splitting are also found at k≃1/3d(Γ-L)(hν=21.2 eV).