title: Fermi surface of nanocrystalline embedded particles in materials: bcc Cu in Fe.
abstract: 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.
authors.affiliation: The Oarai Branch, Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagai
authors.forename: T
authors.initials: T
authors.lastname: Chiba
authors.forename: Z
authors.initials: Z
authors.lastname: Tang
authors.forename: T
authors.initials: T
authors.lastname: Akahane
authors.forename: T
authors.initials: T
authors.lastname: Kanai
authors.forename: M
authors.initials: M
authors.lastname: Hasegawa
authors.forename: M
authors.initials: M
authors.lastname: Takenaka
authors.forename: E
authors.initials: E
authors.lastname: Kuramoto