We have studied two-dimensional and three-dimensional CoSi2 epitaxial layers on Si(111) by polarization-dependent surface extended x-ray-absorption fine structure on the Co K edge (7707 eV). The Co interface atoms are coordinated with eight Si atoms, as in bulk CoSi2, with an interface bond length of 2.35(0.03). Ultrathin three-dimensional CoSi2 layers are 2.5% contracted in the direction perpendicular to the interface.
Evidence of Eightfold Coordination for Co Atoms at the CoSi2/Si(111) Interface / G. Rossi, X. Jin, A. Santaniello, P. Depadova, D. Chandesris. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 62:2(1989), pp. 191-194. [10.1103/PhysRevLett.62.191]
Evidence of Eightfold Coordination for Co Atoms at the CoSi2/Si(111) Interface
G. Rossi;
1989
Abstract
We have studied two-dimensional and three-dimensional CoSi2 epitaxial layers on Si(111) by polarization-dependent surface extended x-ray-absorption fine structure on the Co K edge (7707 eV). The Co interface atoms are coordinated with eight Si atoms, as in bulk CoSi2, with an interface bond length of 2.35(0.03). Ultrathin three-dimensional CoSi2 layers are 2.5% contracted in the direction perpendicular to the interface.
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