Orbital magnetism in transition-metal clusters: from Hund's rules to bulk quenching.
The local and average orbital moments <L> of transition-metal (TM) clusters are determined bridging the gap between atomic Hund's rules and solid-state quenching. A remarkable enhancement of <L> is revealed in agreement with recent measurements. In small Ni(N) (N< or =10), <L> represents (20-40)% of the total magnetization and is therefore crucial for the comparison between theory and experiment. Larger clusters (N> or =150) show nearly bulklike quenching at the interior but retain a considerable surface enhancement. Trends for different TM's are discussed.
Guirado-López
R A
RA
Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico.
Dorantes-Dávila
J
J
Pastor
G M
GM