Related Experiment Videos
Oxide/metal interface distance and epitaxial strain in the NiO/Ag(001) system
Carlo Lamberti1, Elena Groppo, Carmelo Prestipino
1Department of Inorganic, Physical and Materials Chemistry, University of Torino, Via P. Giuria 7, I-10125 Torino, Italy. carlo.lamberti@unito.it
Abstract:
Geometric parameters of NiO films epitaxially grown on Ag(001) were determined using two independent experimental techniques and ab initio simulations. Primary beam diffraction modulated electron emission experiments determined that the NiO films grow with O on top of Ag and that the oxide/metal interface distance is d=2.3+/-0.1 A. Polarization-dependent x-ray absorption, at the Ni-K edge, determined the tetragonal strain (r( parallel )=2.046+/-0.009 A, r( perpendicular )=2.12+/-0.02 A) and d=2.37+/-0.05 A. Periodic slab model results agree with the experiments (d=2.40, r( parallel )=2.07, r( perpendicular )=2.10 A; the O-on-top configuration is the most stable).