An ultra-thin PdMn intermetallic compound on W(110)

A study of Pd and Mn to-deposited on W(110) is presented. Using high resolu tion tore level photoelectron spectroscopy and low energy electron diffract ion it is shown that heating of a sandwich consisting of 1 ML each of Pd an d Mn yields a double-layer PdMn compound with a c(2 x 2) structure. The lay ers are suggested to be [1 1 0] planes of a PdMn compound with CsCl structu re. This relies on the fact that such a phase exists in the bulk, with a la ttice parameter nearly identical to that of W, The results demonstrate the feasibility for growth of ultra-thin ordered Pd-Mn films where the stoichio metry and the geometric structure call be controlled. (C) 2001 Elsevier Sci ence B.V. All rights reserved.