A versatile fabrication method for cluster superlattices

Alpha T. N'Diaye (1) , Timm Gerber (1) , Carsten Busse (1) , Josef Myslivecek (2) , Johann Coraux (3) , Thomas Michely (1)

1 II. Physikalisches Institut [Köln]
2 Faculty of Mathematics and Physics [Praha/Prague]
3 NEEL - Quan2m - Interactions modulables dans des états quantiques 2D

On the graphene moire on Ir(111) a variety of highly perfect cluster superlattices can be grown as shown is for Ir, Pt, W, and Re. Even materials that do not form cluster superlattices upon room temperature deposition may be grown into such by low temperature deposition or the application of cluster seeding through Ir as shown for Au, AuIr, FeIr. Criteria for the suitability of a material to form a superlattice are given and largely confirmed. It is proven that at least Pt and Ir even form epitaxial cluster superlattices. The temperature stability of the cluster superlattices is investigated and understood on the basis of positional fluctuations of the clusters around their sites of minimum potential energy. The binding sites of Ir, Pt, W and Re cluster superlattices are determined and the ability to cover samples macroscopically with a variety of superlattices is demonstrated.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Alpha T. N'Diaye, Timm Gerber, Carsten Busse, Josef Myslivecek, Johann Coraux, et al.. A versatile fabrication method for cluster superlattices. New Journal of Physics, 2009, 11, pp.103045. ⟨10.1088/1367-2630/11/10/103045⟩. ⟨hal-00419276⟩