Recovering the Fermi surface with 2D-ACAR spectroscopy in samples with defects

13th International Workshop on Slow Positron Beam Techniques and Applications

Dugdale, S.B.^1 ; Laverock, J.^2

HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom^1

Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States^2

关键词: Angular correlation of positron annihilation radiations;    First Brillouin zone;    Momentum distributions;    Radial anisotropy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012046/pdf
DOI  :  10.1088/1742-6596/505/1/012046

来源: IOP

【 摘 要 】

When two-dimensional angular correlation of positron annihilation radiation (2D-ACAR) experiments are performed in metals containing defects, conventional analysis in which the measured momentum distribution is folded back into the first Brillouin zone is rendered ineffective due to the contribution from positrons annihilating from the defect. However, by working with the radial anisotropy of the spectrum, it is shown that an image of the Fermi surface can be recovered since the defect contribution is essentially isotropic.