Journal
PHYSICAL REVIEW B
Volume 64, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.64.193410
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The a phase of Sn/Ge (111) has been investigated from 120 K up to 500 K, using synchrotron radiation core-level photoemission. By means of photoelectron diffraction experiments, we verified that the rippled structure of the low-temperature (3 x 3) phase is preserved in the (root3 x root3)R30 degrees phase at room temperature, thus confirming the order-disorder character of the phase transition. We also found that at least two components are present in the Sn 4d core-level spectra up to 500 K, i.e., about 300 K above the onset of the transition from the low-temperature (3 x 3) phase to the (root3 x root3)R30 degrees phase, thus excluding the occurrence of any displacive transition.
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