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The collective vibrational motions along the surface normal direction of the expansively strained Gd(0001) surface has been investigated. The effective Debye temperature, indicative of the dynamic motion of lattice normal to the surface, is 137+/-35 K from X-ray photoemission. With angle-resolved spin polarized photoemission spectroscopy, the Debye temperature is determined to be 79+/-35 K in spin...
We have investigated vibrational motions of the ErAs (100) surface, in the normal direction, by the low energy electron diffraction and X-ray photoemission spectroscopy. We have exploited the differences in electron mean free path, with changes in electron kinetic energies, to illuminate the dramatically lower effective Debye temperature of the surface. The effective surface Debye temperature, indicative...
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