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

Positron 2D-Acar Experiments and Electron-Positron Momentum Density in YBa2Cu307−x

1991 ◽  
Vol 253 ◽  
Author(s):  
L.C. Smedskjaer ◽  
A. Bansil ◽  
U. Welp ◽  
Y. Fang ◽  
K.G. Bailey
Keyword(s):  
Fermi Surface ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Positron Annihilation ◽  
Experimental Spectrum ◽  
Momentum Density ◽  
Band Theory ◽  
Electron Positron ◽  
Theory Framework

ABSTRACTWe discuss positron annihilation (2D-ACAR) measurements in the c-projection on an untwinned metallic single crystal of YBa2Cu3O7-x as a function of temperature, for five temperatures ranging from 30K to 300K. The measured 2D-ACAR intensities are interpreted in terms of the electron-positron momentum density obtained within the KKR-band theory framework. The temperature dependence of the 2D-ACAR spectra is used to extract a ‘background corrected’ experimental spectrum which is in remarkable accord with the corresponding band theory predictions, and displaysin particular clear signatures of the electron ridge Fermi surface.

COMPOSITION DEPENDENCE OF THE POSITRON ANNIHILATION IN Zn1-xBexSe

2005 ◽  
Vol 19 (17) ◽  
pp. 849-860
Author(s):  
F. BENKABOU
Keyword(s):  
Positron Annihilation ◽  
Energy Gap ◽  
Momentum Density ◽  
Annihilation Radiation ◽  
Virtual Crystal Approximation ◽  
Zinc Blende ◽  
Electron Positron ◽  
Wide Energy ◽  
Pseudo Potential ◽  
Zinc Blende Structure

In order to clarify the electronic and optical properties of wide-energy gap zinc-blende structure ZnSe , BeSe and their alloys, a simple pseudo-potential scheme (EPM), within an affective potential the virtual crystal approximation (VCA) which incorporates compositional disorder as an effective potential are presented. Angular correlation of positron annihilation radiation (ACPAR) along different crystallographic directions in Zn 1-x Be x Se are calculated. We observe that the electron-positron momentum density increases rapidly with increasing Beryllium content.

scholarly journals Calculation of the Doppler broadening of the electron-positron annihilation radiation in defect-free bulk materials

2000 ◽  
Vol 61 (15) ◽  
pp. 10092-10099 ◽  
Author(s):  
V. J. Ghosh ◽  
M. Alatalo ◽  
P. Asoka-Kumar ◽  
B. Nielsen ◽  
K. G. Lynn ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Annihilation Radiation ◽  
Doppler Broadening ◽  
Bulk Materials ◽  
Electron Positron Annihilation ◽  
Electron Positron

Experimental study of jets in electron-positron annihilation

1981 ◽  
Vol 101 (1-2) ◽  
pp. 129-134 ◽  
Author(s):  
W. Bartel ◽  
D. Cords ◽  
P. Dittmann ◽  
R. Eichler ◽  
R. Felst ◽  
...  
Keyword(s):  
Experimental Study ◽  
Positron Annihilation ◽  
Electron Positron Annihilation ◽  
Electron Positron
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