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Order-disorder character of the (3 x 3) to (sqrt3 x sqrt3)R30° phase transition of Sn on Ge(111) (Articolo in rivista)

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Order-disorder character of the (3 x 3) to (sqrt3 x sqrt3)R30° phase transition of Sn on Ge(111) (Articolo in rivista) (literal)

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Alternative label

L. Petaccia1, L. Floreano1,*, A. Goldoni2, D. Cvetko1,2,3, A. Morgante1,4, L. Grill1, A. Verdini1, G. Comelli1,4, G. Paolucci2, and S. Modesti1,4 (2001)
Order-disorder character of the (3 x 3) to (sqrt3 x sqrt3)R30° phase transition of Sn on Ge(111)
in Physical review. B, Condensed matter and materials physics; The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
(literal)

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L. Petaccia1, L. Floreano1,*, A. Goldoni2, D. Cvetko1,2,3, A. Morgante1,4, L. Grill1, A. Verdini1, G. Comelli1,4, G. Paolucci2, and S. Modesti1,4 (literal)

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1Laboratorio TASC, Istituto Nazionale per la Fisica della Materia, Basovizza SS14 Km 163.5, I-34012 Trieste, Italy 2Sincrotrone Trieste SCpA, Basovizza SS14 Km 163.5, I-34012 Trieste, Italy 3Jo?ef Stefan Institute, Department of Physics, Ljubljana University, Ljubljana, Slovenia 4Department of Physics, University of Trieste, Via Valerio 2, I-34100 Trieste, Italy (literal)

Titolo

Order-disorder character of the (3 x 3) to (sqrt3 x sqrt3)R30° phase transition of Sn on Ge(111) (literal)

Abstract

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. (literal)

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