Wurtzite-type CoO nanocrystals in ultrathin ZnCoO films.
Surface x-ray diffraction experiments reveal that, in cobalt-doped ZnO films two to five monolayers thick, Wurtzite-type CoO nanocrystals are coherently embedded within a hexagonal boron-nitride- (h-BN)-type ZnO matrix, supporting the model of a phase separation. First-principles calculations confirm that, in contrast with ZnO, the formation of h-BN-type CoO is unfavorable in the ultrathin film limit. Our results are important for understanding magnetic properties of transition metal-doped semiconductors in general.
Meyerheim
H L
HL
Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany.
Tusche
C
C
Ernst
A
A
Ostanin
S
S
Maznichenko
I V
IV
Mohseni
K
K
Jedrecy
N
N
Zegenhagen
J
J
Roy
J
J
Mertig
I
I
Kirschner
J
J