Fermi surface of nanocrystalline embedded particles in materials: bcc Cu in Fe.
We report that a positron can act as a probe to directly reveal electronic structures of nanocrystalline embedded particles in materials. The Fermi surface (FS) of "bcc" Cu nanoparticles in an Fe matrix is observed as the first example. A two-dimensional angular correlation of the positron annihilation radiation (2D-ACAR) method is used to measure the momentum distribution which reflects the FS topology. The obtained 2D-ACAR spectra show strong and characteristic anisotropy associated with the necks of the FS around the [110] Brillouin zone boundaries of the bcc Cu, which are well reproduced by full-potential linearized argumented plane-wave calculations.
Nagai
Y
Y
The Oarai Branch, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan.
Chiba
T
T
Tang
Z
Z
Akahane
T
T
Kanai
T
T
Hasegawa
M
M
Takenaka
M
M
Kuramoto
E
E