A High-Resolution Compton Scattering Study of the Electron Momentum Density in Al

Details A High-Resolution Compton Scattering Study of the Electron Momentum Density in Al A High-Resolution Compton Scattering Study of the Electron Momentum Density in Al

2000-09-08

arxiv.org/abs/cond-mat/0009123v1

Physics

Condensed Matter

Materials Science

7 pages, 6 figures, regular article

Scientific paper

10.1103/PhysRevB.62.16528

We report high-resolution Compton profiles (CP's) of Al along the three principal symmetry directions at a photon energy of 59.38 keV, together with corresponding highly accurate theoretical profiles obtained within the local-density approximation (LDA) based band-theory framework. A good accord between theory and experiment is found with respect to the overall shapes of the CP's, their first and second derivatives, as well as the anisotropies in the CP's defined as differences between pairs of various CP's. There are however discrepancies in that, in comparison to the LDA predictions, the measured profiles are lower at low momenta, show a Fermi cutoff which is broader, and display a tail which is higher at momenta above the Fermi momentum. A number of simple model calculations are carried out in order to gain insight into the nature of the underlying 3D momentum density in Al, and the role of the Fermi surface in inducing fine structure in the CP's. The present results when compared with those on Li show clearly that the size of discrepancies between theoretical and experimental CP's is markedly smaller in Al than in Li. This indicates that, with increasing electron density, the conventional picture of the electron gas becomes more representative of the momentum density and that shortcomings of the LDA framework in describing the electron correlation effects become less important.

Affiliated with

Also associated with

No associations

Rating

A High-Resolution Compton Scattering Study of the Electron Momentum Density in Al does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A High-Resolution Compton Scattering Study of the Electron Momentum Density in Al, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A High-Resolution Compton Scattering Study of the Electron Momentum Density in Al will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-203635