INVESTIGADORES
FUHR Javier Daniel
artículos
Título:
Order-disorder phase transition of vacancies in surfaces: The case of Sn/Cu(001)-0.5 ML
Autor/es:
J. E. GAYONE; A. CARRERA; O. GRIZZI; S. BENGIÓ; E. A. SÁNCHEZ; J. MARTÍNEZ-BLANCO; E. G. MICHEL; J. D. FUHR; H. ASCOLANI
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2010 vol. 82 p. 35420 - 35420
ISSN:
1098-0121
Resumen:
We investigate the structural phase transition (3sqrt(2)xsqrt(2))R45º (sqrt(2)xsqrt(2))R45º of 0.5 ML of 0.5 ML Sn/Cu(001) using a combination of scanning tunneling microscopy, time-of-flight direct-recoil spectroscopy, and Monte Carlo simulations. Cu vacancies are observed for both phases. At low temperature, Cu vacancies are ordered in a regular array of lines. At high temperature, Sn atoms occupy similar adsorption sites as at low temperature but Cu vacancies are disordered. We conclude that the atomistic mechanism behind the structural phase transition is an order/disorder transition driven by the Cu-vacancy entropy.
