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Order-disorder transition of the (3x3)Sn/Ge(111) phase (Articolo in rivista)

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Order-disorder transition of the (3x3)Sn/Ge(111) phase (Articolo in rivista) (literal)

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L. Floreano1,*, D. Cvetko1,2, G. Bavdek1,2, M. Benes1,3, and A. Morgante1,3 (2001)
Order-disorder transition of the (3x3)Sn/Ge(111) phase
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. Floreano1,*, D. Cvetko1,2, G. Bavdek1,2, M. Benes1,3, and A. Morgante1,3 (literal)

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

Titolo

Abstract

We have measured the long-range order of the ? phase of Sn on the Ge(111) surface throughout the (3×3)->(?3×?3)R30° phase transition. The transition has been found of the order-disorder type with a critical temperature Tc~220 K. The expected three-state Potts critical exponents are shown to be consistent with the observed power-law dependence of the (3×3) order parameter and its correlation length close to Tc, thus excluding a charge-density wave driven phase transition. (literal)

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