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- W1973800963 abstract "Angle-resolved polarization-dependent photoelectron spectroscopy using synchrotron radiation has been used to determine the energy-versus-momentum band dispersions and magnetic exchange splitting of Ni. Using Ni(111) and Ni(100) crystals, the band dispersions along the $ensuremath{Gamma}ensuremath{-}L$ and $ensuremath{Gamma}ensuremath{-}X$ lines have been determined for the $s$ and $d$ bands. The temperature-dependent magnetic exchange splitting $ensuremath{Delta}{E}_{mathrm{ex}}$ of the upper ${ensuremath{Lambda}}_{3}$ band has been directly observed and found to be independent of momentum $stackrel{ensuremath{rightarrow}}{mathrm{k}}$ for a large region of the Brillouin zone. The experimental value of $ensuremath{Delta}{E}_{mathrm{ex}}=0.31ifmmodepmelsetextpmfi{}0.03$ eV is smaller than recent calculated values ($0.6ensuremath{le}ensuremath{Delta}{E}_{mathrm{ex}}ensuremath{le}0.9$ eV) obtained with spin-polarized self-consistent band calculations. Also, calculated $d$-band widths are larger (typically 40%) than measured (3.4 eV at $L$). Our results are consistent with Fermi-surface data and the polarization reversal observed in spin-polarized photoemission. A number of previous contradictory photoemission studies of Ni are discussed in view of our results. The observed bands show that ferromagnetic nickel can be described by a Stoner-Wohlfarth-Slater spin-split band model." @default.
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- W1973800963 date "1979-03-15" @default.
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- W1973800963 title "Experimental energy-band dispersions and exchange splitting for Ni" @default.
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- W1973800963 doi "https://doi.org/10.1103/physrevb.19.2919" @default.
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