Me. Davila et al., Determination of the lattice relaxation at the Yb(111) surface using chemical-shift photoelectron diffraction, PHYS REV B, 62(3), 2000, pp. 1635-1638
A quantitative analysis of the surface relaxation of thick Yb(111) single-c
rystal films grown on W(110) has been performed by photoelectron diffractio
n technique using high-energy resolution photoemission spectra of the surfa
ce core-level shift of Yb 4f. Our results demonstrate that Yb grows epitaxi
ally in a fee structure without surface reconstruction. The surface atoms p
resent an inward relaxation of the first and second layers by (3.6+/-0.3)%
and (1.9+/-0.2)% of the bulk interlayer spacing, respectively. The appearan
ce of the d-like surface-state at Yb(111) is assumed to be responsible for
the inward surface relaxation.