The effective spin dependent Debye temperature of Gd(0001)

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 majority, and 125±35 K for spin minority. Residual spin-mixing contributions to bands with Stoner like behavior as well as contributions from the spin dependent plasmon modes for Gd(0001) are implicated