Size-dependent paramagnetic-ferromagnetic phase transition in palladium clusters

Authors
Vitos, L Johansson, B Kollar, J
Citation
L. Vitos et al., Size-dependent paramagnetic-ferromagnetic phase transition in palladium clusters, PHYS REV B, 62(18), 2000, pp. R11957-R11960
Citations number
27
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
18
Year of publication
2000
Pages
R11957 - R11960
Database
ISI
SICI code
0163-1829(20001101)62:18<R11957:SPPTIP>2.0.ZU;2-M
Abstract
Ab initio calculations performed for T=0 K show that in palladium clusters below a critical size the high surface energy anisotropy stabilizes the ico sahedral multiply twinned particle structure against the fee structure. Mod el calculations support the appearance of ferromagnetic order for the noncr ystallographic icosahedral symmetry with a small (0.11 mu (B)) magnetic mom ent per atom. These results explain the recent experimental findings [Europ hys. Lett. 38, 195 (1997)] that small free palladium clusters exhibit spont aneous ferromagnetic order.