Periodic lattice distortion accompanying the(3×3)charge-density-wave phase of Sn/Ge(111)

Nature of the Low-Temperature3×3Surface Phase of Pb/Ge(111)

“…A similar phenomenology has been observed for Sn͞Ge(111) [4,5]. A structural study for this interface [6] found no significant rippling in the Sn layer and attributed the 3 3 3 phase to lateral atomic displacements in the first Ge layer.…”

“…Core-level photoemission for Sn͞Ge(111) indicates the existence of two kinds of Sn atoms in the 3 3 3 phase [8,9]. All these experiments could be interpreted assuming a corrugated Sn or Pb layer, but this idea disagrees with the structural model found by Baddorf et al [6] for Sn͞Ge(111).…”

Phase Transitions in Two Dimensions: The Case of Sn Adsorbed on Ge(111) Surfaces

“…The results of a Keating energy minimization are incompatible with the smaller value so we are forced to conclude that the analysis presented in Ref. [8] is incorrect. As shown in Fig.…”

“…1. To add to the confusion the postulated Sn atom displacement in the (3×3) structure was not found in a recent surface x-ray diffraction (SXRD) study [8].…”

“…Note added: Zhang et al have re-analyzed their previously published SXRD data for the Ge(111)/Sn phases [8] in conjunction with IV-LEED data [12] and find an outward displacement of 0.37Å for one Sn atom. However, the displacements in the substrate differ from the values reported in this letter.…”