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Journal Article

Pokrovsky-Talapov commensurate-incommensurate transition in the CO/Pd(100) system


Schuster,  Rolf
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Schuster, R., Robinson, I., Kuhnke, K., Ferrer, S., Alvarez, J., & Kern, K. (1996). Pokrovsky-Talapov commensurate-incommensurate transition in the CO/Pd(100) system. Physical Review B, 54(23), 17 097-17 101. doi:10.1103/PhysRevB.54.17097.

Cite as: https://hdl.handle.net/21.11116/0000-0009-B660-D
X-ray-diffraction measurements have been carried out for a monolayer of CO on the Pd(100) surface. Because of equilibrium with the gas phase, at constant pressure a series of structures is formed with varying temperature (varying coverage). One structure at 350 K selected for crystallographic analysis, is found to be a commensurate lattice with p2gg symmetry of CO molecules bound in substrate-bridge sites. The vibration amplitudes of the molecules are substantially larger in-plane than out-of-plane. Upon cooling, a phase transition is crossed beyond which the structure becomes incommensurate. Symmetry considerations and the measured exponent of 0.5±0.05 establish this transition to be in the Pokrovsky-Talapov universality class.