Физика Низких Температур: Том 27, Выпуск 9-10 (Сентябрь 2001), c. 1148-1152 ( к оглавлению , назад )
A vitrifying structure transition in the Dy/Mo(112) adsorption system
A. Fedorus, V. Koval , and A. Naumovets
Institute of Physics, National Academy of Sciences of Ukraine, 46 Nauki Ave., Kiev, 03028, Ukraine
Institut für Festkörperphysik, Universität Hannover, Appelstrabe 2, D-30167 Hannover, Germany
Received April 25, 2001
Annealing-driven irreversible structural transitions are studied by low energy electron diffraction in submonolayer Dy films adsorbed on the Mo(112) surface. In a wide coverage range q > 0.07, Dy overlayers deposited at low temperatures (T≈ 100 K) are ordered and keep their structure upon annealing up to 350-600 K. Near q = 0.68, the overlayers are stable to high-temperature annealing
(Ta = 1000 K) as well, whereas the denser films are metastable and transform to more stable ordered structures. An unusual annealing effect is found for q < 0.58: the initially ordered metastable phases are replaced by phases having no extended order, which are assumed to be two-dimensional glasses.