Interface structures of ordered Fe and Gd overlayers on W(110) from site-specific photoelectron diffraction
- Univ. of California, Davis, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
- Univ. of California, Davis, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; ICMM-CSIC, Madrid (Spain)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
A key advantage of photoelectron diffraction (PD) as a surface structure probe is in permitting state-resolved or site-specific structural determinations via core level binding energy shifts. This method has not been applied previously to metal-metal interfaces, and the authors here report site-specific and full-solid-angle photoelectron diffraction data from interface W atoms just beneath ordered (1x1) Fe and (7x14) Gd monolayers on W(110). These data were obtained by utilizing core level shifts in the W 4f{sub 7/2} spectrum. Shinn et al. first observed interface core-level shifts (ICLS`s) in W 4f{sub 7/2} photoelectron spectra from W(110) surfaces covered with one monolayer (ML) of Ni, Pt, or Fe in pseudomorphic (1x1) structures. In the case of (1x1) Fe, the W 4f{sub 7/2} spectrum consists of three components: one from the interfacial W layer shifted by {minus}225 meV from the bulk position, another from what appears to be the second W layer shifted by {minus}80 meV, and a third from the bulk W atoms situated below (which is found to remain at the same distance from the Fermi level as for the clean surface). In this study, the authors have examined both the pseudomorphic (1x1) Fe monolayer on W(110) and the non-pseudomorphic (7x14) Gd monolayer on W(110), which forms a Moire pattern with long-range order. Comparison of their experimental data with multiple scattering calculations permits determining the Fe adsorption site and the relative interlayer spacing to the first and second W layers. These Fe results are also compared to those from the very different Gd overlayer and from the clean W(110) surface which has recently been studied by Ynzunza et al. as a reference case.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 603663
- Report Number(s):
- LBNL-39981; ON: DE97007345; CNN: Contract N00014-94-0162; TRN: 98:009604
- Resource Relation:
- Related Information: Is Part Of Advanced light source: Compendium of user abstracts 1993--1996, 622 p.
- Country of Publication:
- United States
- Language:
- English
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