ISSN:
1434-6036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract. Surface structures in the Te/Ni(111) system are revealed by using reflection high-energy electron diffraction combined with X-ray and ultraviolet photoelectron spectroscopies. At a 0.33 mono-layer (ML)-Te/Ni(111) surface, a reversible structural phase transition is observed with a transition temperature T c of 380 $^{\circ}$ C. The diffraction pattern from the low temperature phase is accompanied by streaks. The high and low temperature phases are characterized by $\sqrt{3} \times \sqrt{3} R\pm30^{\circ}$ and $3 \times \sqrt{3}$ rectangle, respectively. The mechanism of the phase transition is explained by the order-disorder transition with a rumpled chain model. Both 0.51 ML- and 0.44 ML-Te/Ni(111) surfaces exhibit the complex diffraction patterns accompanied by diffuse streaks. These surface structures are characterized by the $7 \times \sqrt{3}$ rectangle and $5 \sqrt{3} \times \sqrt{3} R \pm30^{\circ}$ , respectively. All diffuse streaks obtained at the above surfaces are consistently interpreted in the view of the ill-ordered arrangements of the well-ordered $\sqrt{3}$ linear chains. It is shown that the “ $\sqrt{3}$ linear structure” is the key in the Te/Ni(111) system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjb/e2004-00106-1
