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Interpretation of Positron Annihilation Curves for Lithium by Mijnarends' Method. Has the Fermi Surface of Lithium a Neck?
Author(s) -
Stachowiak H.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700410214
Subject(s) - annihilation , fermi gamma ray space telescope , fermi surface , lithium (medication) , physics , positron annihilation , positron , radius , electron , momentum (technical analysis) , atomic physics , core electron , interpretation (philosophy) , nuclear physics , condensed matter physics , medicine , computer security , finance , computer science , economics , endocrinology , programming language
The positron annihilation curves of Donaghy and Stewart for lithium have been reinterpreted using Mijnarends' method. In this way it has been possible to split the total number of counts into two parts, one corresponding to electron momenta inside the main Fermi surface, the other arising from higher momentum components of the conduction electron wave functions and core annihilation. Evidence is found for the possible existence of a neck in the Fermi surface in the (110) direction with a radius of the order of 13% of the free electron sphere radius. The need for more detailed experimental investigations of positron annihilation in lithium is emphasized.