title: Experimental investigation on anisotropic characteristic of YBa3B9O18.
abstract: The energy loss near edge fine structures of the B-K edge and O-K edge have been examined in the optical material YBa3B9O18. The orientation-dependent electron energy-loss spectra (EELS) for both B-K edge and O-K edge were observed. The experimental results were analyzed based on density functional theory calculations. The unoccupied pz features dominated the EELS when it was collected under the energy transfer q along c orientations and pxy states were probed when q was perpendicular to the crystallographic c axis. The results provide direct experimental evidence on the anisotropic characteristic of YBa3B9O18.
authors.affiliation: Department of Physics, Dalian Jiaotong University, Dalian, China. Electronic address: heming@djtu.edu.cn.
authors.forename: Ming
authors.initials: M
authors.lastname: He
authors.affiliation: Liaoning Key Materials Laboratory for Railway, Dalian Jiaotong University, Dalian, China.
authors.forename: T Z
authors.initials: TZ
authors.lastname: Liu
authors.affiliation: School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China.
authors.forename: J
authors.initials: J
authors.lastname: Cai
authors.affiliation: Liaoning Key Materials Laboratory for Railway, Dalian Jiaotong University, Dalian, China.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhang
authors.affiliation: Department of Physics, Dalian Jiaotong University, Dalian, China.
authors.forename: X E
authors.initials: XE
authors.lastname: Gu
keywords: Anisotropy; Borate; Density of states; Electron energy-loss spectra; Optical crystal