Effective method to identify the vacancies in crystalline GeTe

摘要

X-ray diffraction and photoelectron spectroscopy of different Co-doped concentration GeTe havenbeen made to identify the vacancies in rock-salt GeTe. The results show that Co occupiesngermanium vacancy and forms Co–Te bond, but the alloy retains a rock-salt structure when thenconcentration of doped Co is less than the vacancy ratio in crystalline GeTe. If we construct 8%ngermanium vacancy and relative distortion in rock-salt GeTe, the magnetism calculation based onnspin-polarized density functional theory of Co-doped GeTe agrees well with superconductingnquantum interference device magnetometer result. From experiment and calculation results, we cannconfirm the existence of vacancies in rock-salt GeTe and the ratio is 8%. © 2010 American Institutenof Physics. u0004doi:10.1063/1.3531664