Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-05-26
Physical Review B 82, 125127 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
The state-dependence of the enhancement of the electron-positron momentum density is investigated for some transition and simple metals (Cr, V, Ag and Al). Quantitative comparison with linearized muffin-tin orbital calculations of the corresponding quantity in the first Brillouin zone is shown to yield a measurement of the enhancement of the s, p and d states, independent of any parameterizations in terms of the electron density local to the positron. An empirical correction that can be applied to a first-principles state-dependent model is proposed that reproduces the measured state-dependence very well, yielding a general, predictive model for the enhancement of the momentum distribution of positron annihilation measurements, including those of angular correlation and coincidence Doppler broadening techniques.
Alam Muhammad A.
Dugdale S. B.
Haynes T. D.
Laverock J.
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