In positron annihilation studies of the electronic structure of metals, a nonuniform positron density can distort significantly the faithful detection of the Fermi surface. Recently, we have predicted a nearly complete cancellation of the aforementioned distortion in the spin-polarized two-dimensional angular correlation of annihilation radiation experiment on CrO2 [M. Biasini and J. Rusz, J. Phys.: Condens. Matter 18, L289 (2006)]. We provide a detailed investigation of the predicted effect on several transition-element- and actinide-based systems of increasing complexity, demonstrating that the cancellation effect is of rather general nature.
Positron Wave-Function Effects in the Measurement of the Two-Dimensional Angular Correlation of the Annihilation Radiation of a Spin-Polarized System
2007
Abstract
In positron annihilation studies of the electronic structure of metals, a nonuniform positron density can distort significantly the faithful detection of the Fermi surface. Recently, we have predicted a nearly complete cancellation of the aforementioned distortion in the spin-polarized two-dimensional angular correlation of annihilation radiation experiment on CrO2 [M. Biasini and J. Rusz, J. Phys.: Condens. Matter 18, L289 (2006)]. We provide a detailed investigation of the predicted effect on several transition-element- and actinide-based systems of increasing complexity, demonstrating that the cancellation effect is of rather general nature.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
