Many-body effects on the electron-positron momentum density in simple and transition metals: Comparison with positron annihilation spectroscopy data

2006 ◽  
Vol 73 (7) ◽  
Author(s):  
H. Sormann ◽  
G. Kontrym-Sznajd
Keyword(s):  
Transition Metals ◽  
Positron Annihilation ◽  
Positron Annihilation Spectroscopy ◽  
Momentum Density ◽  
Spectroscopy Data ◽  
Many Body ◽  
Electron Positron ◽  
Many Body Effects

a-axis-projected electron-positron-momentum density and positron-annihilation spectra inYBa2Cu3O7−x

1994 ◽  
Vol 50 (9) ◽  
pp. 6408-6415 ◽  
Author(s):  
R. Pankaluoto ◽  
A. Bansil ◽  
L. C. Smedskjaer ◽  
P. E. Mijnarends
Keyword(s):  
Positron Annihilation ◽  
Momentum Density ◽  
Electron Positron

Influence of Electron-Electron Correlations and Lattice Effects on Positron-Electron Enhancement Factors

2010 ◽  
Vol 666 ◽  
pp. 5-9 ◽  
Author(s):  
Edward Boroński
Keyword(s):  
Electron Gas ◽  
Momentum Density ◽  
Many Body ◽  
Fermi Sphere ◽  
Self Energy ◽  
Density Distributions ◽  
Lattice Effects ◽  
Electron Positron ◽  
Enhancement Factors ◽  
Momentum Distributions

We present an approach taking into account the effect of electron-electron (e-e) correlations on electron-positron (e-p) momentum density distributions. The approach bases on the modification of the Bethe-Goldstone (B-G) equation for the positron in the electron gas due to self-energy effects. The example calculations have been performed for selected parameters corresponding to simple metals. The calculated dependencies exhibit the increase of the e-p enhancement factors below Fermi momentum, like Kahana enhancements, and a decrease above the Fermi sphere, leading to a many-body “tail” in the e-p momentum density distributions. Moreover, the influence of lattice effects on enhancement factors (EF) is taken into account. This decreases by a few percent the absolute values of the e-p momentum distributions and the corresponding annihilation rates and for real metals such as Mg or Cu evidently improve the agreement with experiment.

scholarly journals Atomic Many-Body Effects for thep-Shell Photoelectron Spectra of Transition Metals

2000 ◽  
Vol 84 (10) ◽  
pp. 2259-2262 ◽  
Author(s):  
Paul S. Bagus ◽  
R. Broer ◽  
W. A. de Jong ◽  
W. C. Nieuwpoort ◽  
F. Parmigiani ◽  
...  
Keyword(s):  
Transition Metals ◽  
Photoelectron Spectra ◽  
Many Body ◽  
Many Body Effects

Cyclotron Masses and Many-Body Effects in Transition Metals

1982 ◽  
Vol 109 (2) ◽  
pp. 627-633 ◽  
Author(s):  
B. Schmidt ◽  
V. N. Antonov ◽  
E. Mrosan
Keyword(s):  
Transition Metals ◽  
Many Body ◽  
Many Body Effects
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