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Investigation of the Electronic Structure of Uranium Compounds UX 2 (X Pnigogen) and UAsY (Y Chalcogen) by Positron Annihilation
Author(s) -
Dȩbowska E.,
Rozenfeld B.
Publication year - 1980
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.2221010143
Subject(s) - fermi surface , physics , anisotropy , fermi gamma ray space telescope , condensed matter physics , momentum (technical analysis) , fermi level , delocalized electron , electron , positron , atomic physics , nuclear physics , quantum mechanics , finance , economics
The electron momentum density distributions ϱ( p ) in USb 2 , UP 2 , and UAsS are calculated for various sets of lattice harmonics F ϱ, using Mijnarends's method. The selection of the adequate set of harmonics is made by a comparison of the anisotropic parts of ϱ( p ) with “difference” momentum density distributions ϱ r ( p ) obtained on the basis of the difference angular correlation of positron annihilation quanta curves. From “summed up” distributions ϱ s ( p ) = ϱ poly ( p )+ ϱ r ( p ) Fermi momenta along different directions are estimated. The character of the Fermi momenta changes suggests an ellipsoidal shape of Fermi surface, which corresponds to extremely large anisotropy of electric conductivity along [001] and [100] directions of the tetragonal unit cell of these compounds.