We have measured the long range order of the α-phase of Sn on the Ge(111) surface throughoutThe transition has been found of the order-disorder type with a critical temperature Tc ∼ 220 K. The expected 3-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.
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