Submonolayer Coverage Structural and Local Electronic Properties

1 Gd on W(llO) at Submonolayer Coverage Structural and Local Electronic Properties 

3 Structural and Electronic Properties of Rate Earth Metal Systems 

Consistently with this work evaporation of (45 5) ML Gd on the W(llO) substrate held at 293 K and subsequent annealing at 710 K for 2 min leads to smooth Gd(OOOl) films (see Fig. 3.6a). The atomically flat terraces are 10 nm-1 pm wide. Although these films reveal a sharp (1x1) LEED pattern and the 

In contrast, island formation could be observed at lower coverage of approximately 10 ML even if the substrate temperature did not exceed 530 K (see Fig. 3.6b). These islands exhibit a local coverage of at least 4 ML, are atomically flat on top and will be described in more detail below. Between the islands the W(llO) substrate is covered by a wetting layer of hexagonal but heavily distorted Gd. Two different models for the atomic structure of this so-called (14 x 7) structure have been described by other authors [23, 24]. 

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