Abstract
The Ising-transition of Pt(110)(1 × 2), which so far has been studied only by diffraction techniques, is investigated by high temperature scanning tunneling microscopy. Our in situ real space investigation with atomic scale resolution reveals the simultaneous formation of 2D island/hole units at the originally flat terraces. The phase transition therefore is in accordance with the step-pairing model of Vilfan and Villain [Phys. Rev. Lett. 65 (1990) 1830] and the disordered flat (DOF) phase proposed by den Nijs [Phys. Rev. Lett. 66 (1991) 907], which both are characterized by a long-range three layer up-down order.
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