We have measured the long-range order of the alpha phase of Sn on the Ge(111) surface throughout the (3 x 3) --> (root3 x root3)R30 degrees phase transition. The transition has been found of the order-disorder type with a critical temperature T-c similar to 220 K. The expected three-state Potts critical exponents are shown to be consistent with the observed power-law dependence of the (3 x 3) order parameter and its correlation length close to T-c, thus excluding a charge-density wave driven phase transition.
Order-disorder transition of the (3X3) Sn/Ge(111) phase / L., Floreano; D., Cvetko; G., Bavdek; M., Benes; Morgante, Alberto. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 64:(2001), pp. 075405-1-075405-5. [10.1103/PhysRevB.64.075405]
Order-disorder transition of the (3X3) Sn/Ge(111) phase
MORGANTE, ALBERTO
2001-01-01
Abstract
We have measured the long-range order of the alpha phase of Sn on the Ge(111) surface throughout the (3 x 3) --> (root3 x root3)R30 degrees phase transition. The transition has been found of the order-disorder type with a critical temperature T-c similar to 220 K. The expected three-state Potts critical exponents are shown to be consistent with the observed power-law dependence of the (3 x 3) order parameter and its correlation length close to T-c, thus excluding a charge-density wave driven phase transition.Pubblicazioni consigliate
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